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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