?A: My library books are five days overdue .

B: Oh, will you have to pay a fine?

overdue?a. 1.?過期的,到期未付的;2. 早該有的,遲到的,延誤的

A: The bath is overflowing !

B: Oh no, I forgot that I had one running.

overflow?vt. 1.?滿得外溢,外流,泛濫;2.?(with)充滿,洋溢

vt.?淹沒,從...中溢出,多得使無法容納

n. 1.?容納不下的物(或人);2. 溢出,滿出;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.?無意中聽到,偷聽到

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.(與...)部分重疊;2. (與...)部分相同

n.?重疊,重疊的部分

A: Did you make it to the other side of the mountain?

B: No, the overpass was blocked.

overpass?n.?天橋,立交橋

A: My comment overrides my previous statement.

B: You are always changing your mind.

override?vt. 1.?不顧,不理睬,否決;2. 壓倒,優(yōu)先于

A: His dislike for me was overt .

B: Oh, he did not make it that obvious.

overt?a.?公開的,不隱蔽的

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. 使終止,屏棄

n.?傾覆,終止,結(jié)束

A: Our car overturned when it hit the tree.

B: Was anyone injured?

overturn ?vt. 1.?使翻轉(zhuǎn),使傾覆,使倒下;2. 顛覆,推翻

vi.?傾覆,翻轉(zhuǎn),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.?勢不可擋的,壓倒的;2. 巨大的

A: What is that bird?

B: I think it is an owl .

owl.?n.?貓頭鷹

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.?牡蠣

A: Did you hear that the hole in the ozone is increasing in size?

B: Yes, it is a shame.

ozone?n.?臭氧

A: You don’t seem to be arguing with your brother anymore.

B: No, we made a pact not to argue anymore.

pact?n.?契約,協(xié)定,條約