O

A: What type of tree is that?
B: I think it is an oak tree. It is certainly large enough to be one.
oak
n. １．栎树，橡树；２．栎木，橡木

A: Oh no, I’ve dropped an oar .
B: We will have to swim to the shore now.
oar
n.　桨，橹

A: Please tell me the big secret.
B: Sorry, I took an oath and swore that I wouldn’t.
oath
n.　１．誓言，誓约；咒骂，诅咒语
on / under oath　 在法庭上宣过誓

A: My pupils are so obedient , they always do their home work.
B: You are lucky, mine are terrible.
obedient
a.　服从的，顺从的

A: Robert told an obscene joke last night.
B: Is it too rude to repeat to me?
obscene
a.　１．淫秽的，下流的；２．可憎的，可恶的

A: Did you understand the theatre performance?
B: No, it was too obscure for me.
obscure
a.　１．不著名的，不重要的；２．费解的，模糊不清的；３．隐藏的，偏僻的
vt.　使变模糊，掩盖

A: You are always playing video games.
B: I know. I have an obsession.
obsession
n.　困扰，无法摆脱的思想（或情感）

A: Excuse me, but your car is obstructing the entrance to my home.
B: Oh, I’ll move it right away.
obstruct
vt.　１．阻塞，堵塞；２．阻碍，阻止，妨碍

A: Can I move into the apartment today?
B: No, you can have occupancy next week.
occupancy
n.　占有，使用，居住

A: What is that terrible odour ?
B: Oh, sorry, it must be my socks.
odour
n.　气味

A: Beverley looked stunning at the party.
B: Yes, her outfit was offset by her jewelry.
offset
vt.　补偿，抵消

A: Do you have any offspring ?
B: Yes, I have three daughters.
offspring
n.　１．子女，子孙，后代；２．（动物的）崽

A: Do you like olives ?
B: Yes, especially black ones in salad.
olive
n.　橄榄，橄榄树

A: Is that glass clear?
B: No, it is opaque , that is why you are having difficulty seeing through it.
opaque
a.　１．不透明的，不透光的；２．难理解的，晦涩的

A: Women in the old days were frequently oppressed by their husbands.
B: I am glad that times are changing.
oppress
vt.　１．压迫，压制；２．使（心情等）沉重，使烦恼

A: You would like the blue car?
B: No, I think I’ll opt for the red one.
opt
vt. (for)　选择，挑选

A: The weather will be wonderful tomorrow.
B: You are always filled with optimism .
optimism
n.　乐观，乐观主义

A: I study at my optimum between eight and ten in the morning.
B: Oh, I work best in the evenings.
optimum
a.　最合适的，最优的，最佳的

A: Where did you get the apples?
B: I picked them in the orchard down the road.
orchard
n.　果园

A: I was in a serious car accident last year.
B: That must have been a terrible ordeal .
ordeal
n.　苦难经理，折磨，煎熬

A: I love studying science.
B: I orient more towards the Arts.
orient
vt.　１．使适应，使熟悉情况（或环境等）；２．（to ,toward）使朝向，以．．．为方向（目标）
n.　东方，亚洲（尤指远东），东半球

A: Oriental cuisine is my favourite.
B: Yes, I also love Chinese food.
oriental
a. 东方的，东方人的，东方文化的

A: I was unable to find my orientation in the city.
B: You should have carried a map with you.
orientation
n.　１．方向，目标，方位；２．熟悉情况，适应，情况介绍

A: From where does the guitar originate ?
B: Well, there are many types of guitar, so probably many countries.
originate
vi. (in,from,with)　起源于，来自，产生
vt.　创造，创始，开创

A: That is a beautiful ornament beside the TV.
B: Thanks, it was a gift from a friend.
ornament
n.　１．装饰品，点缀品；２．装饰，点缀
vt.　装饰，点缀，美化

A: I was an orphan until the age of seven.
B: Goodness, do you know what happened to your parents?
orphan
n.　孤儿
vt.　使成为孤儿

A: You look very unusual today.
B: Yes, I was tired with the orthodox.
orthodox
a.　１．传统的；２．正统的，正宗的

A: I was ousted from the number one position.
B: But you will have a chance to win it back, don’t worry.
oust
vt.　１．驱逐；２．罢免，把．．．撤职（以取而代之）

A: There was an outbreak of skin disease in my town.
B: Oh, did you contract it?
outbreak
n.　（战争、情感、火山等的）爆发，（疾病，虫害等的）突然发生

A: That is a beautiful outfit you are wearing.
B: Thanks , I got it specially made for this occasion.
outfit
n.　１．（用于某种场合的）全套服装；２．（协同工作的）一组人；３．全套装备，全套工具

A: Let’s go on an outing .
B: OK, where would you like to go?
outing
n.　远足，郊游，短途旅行，外出参观（或看戏等）

A: I saw a film about outlaw in the Wild West.
B: Oh, I hate those types of movies.
outlaw
n. 歹徒，亡命之徒
vt.　宣布．．．为不合法

A: There will be outrage if I am home late again.
B: Don’t worry, they won’t get angry.
outrage
n.　１．义愤，愤慨；２．暴行，骇人听闻的事件
vt.　激起．．．的义愤，激怒

A: Who won the match?
B: There was no outright winner. It was a draw.
outright
ad.　１．坦率地，直率地，无保留地；２．完全地，彻底地；３．立即，当场
a.　１．清楚的，无疑的，明白无误的；２．完全的，彻底的

A: Do you live in the centre of the town?
B: No, just on the outskirts .
outskirts
n.　外围地区，郊区，郊外

A: My library books are five days overdue .
B: Oh, will you have to pay a fine?
overdue
a.　１．过期的，到期未付的；２．早该有的，迟到的，延误的

A: The bath is overflowing !
B: Oh no, I forgot that I had one running.
overflow
vt.　１．满得外溢，外流，泛滥；２．(with)充满，洋溢
vt.　淹没，从．．．中溢出，多得使无法容纳
n.　１．容纳不下的物（或人）；２．溢出，满出；３．溢流口，溢流管

A: Excuse me. I couldn’t help but overhear , but I think I am the person you are looking for.
B: What a coincidence!
overhear
vt.　无意中听到，偷听到

A: It is a shame that our holidays don’t overlap .
B: Indeed, I would love to go on holidays with you.
overlap
v.　１．（与．．．）部分重叠；２．（与．．．）部分相同
n.　重叠，重叠的部分

A: Did you make it to the other side of the mountain?
B: No, the overpass was blocked.
overpass
n.　天桥，立交桥

A: My comment overrides my previous statement.
B: You are always changing your mind.
override
vt.　１．不顾，不理睬，否决；２．压倒，优先于

A: His dislike for me was overt .
B: Oh, he did not make it that obvious.
overt
a.　公开的，不隐蔽的

A: I am planning to overthrow the government.
B: That is a big plan. you will need help.
overthrow
vt.　１．推翻，打倒；２．使终止，屏弃
n.　倾覆，终止，结束

A: Our car overturned when it hit the tree.
B: Was anyone injured?
overturn
vt.　１．使翻转，使倾覆，使倒下；２．颠覆，推翻
vi.　倾覆，翻转，翻倒

A: Were you surprised by the gift?
B: Yes, I was completely overwhelmed .
overwhelm
vt.　１．（感情上）使受不了，使不知所措；２．征服，制服

A: I have an overwhelming need to sleep right now.
B: Well, what is keeping you from having a rest?
overwhelming
a.　１，势不可挡的，压倒的；２．巨大的

A: What is that bird?
B: I think it is an owl .
owl.
n.　猫头鹰

A: Is water a type of oxide ?
B: Yes, as it contains oxygen.
oxide
n.　氧化物

A: Do you enjoy eating oysters ?
B: I have never tasted them.
oyster
n.　牡蛎

A: Did you hear that the hole in the ozone is increasing in size?
B: Yes, it is a shame.
ozone
n.　臭氧

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