名詞 it:

1. the branch of engineering that deals with the use of computers and telecommunications to retrieve and store and transmit information
   同義詞：information technology

1. Where's your car?' It's in the garage.'
   ｀你的汽車在哪兒呢?＇｀在車庫(kù)里＇.
2. The baby next door kept me awake. It cried all night.
   隔壁的孩子吵得我睡不著覺。他整夜哭個(gè)沒完
3. There is a rosebush near the fence and it is very beautiful.
   籬笆附近有一叢玫瑰，長(zhǎng)得非常美麗。
4. It's Friday.
   今天星期五。

it

pron.（代詞）
Used to refer to that one previously mentioned. Used of a nonhuman entity; an animate being whose sex is unspecified, unknown, or irrelevant; a group of objects or individuals; or an abstraction:
表示物體：用于指已經(jīng)提到的事物。用于指無(wú)生命物體；性別不詳、不知或不相關(guān)的有生命物體；事物和群體；抽象物質(zhì)：
例句：
polished the table until it shone; couldn`t find out who it was; opened the meeting by calling it to order.
把桌子擦出光亮；查不出是誰(shuí)；會(huì)議開始，全體肅立

Used as the subject of an impersonal verb:
表示主語(yǔ)：用作非人稱代詞的主語(yǔ)：
例句：
It is snowing.
正在下雪

Used as an anticipatory subject or object:
代主語(yǔ)或賓語(yǔ)：作為先行主語(yǔ)或先行賓語(yǔ)：
例句：
Is it certain that they will winô
他們一定會(huì)贏嗎ô

Used as an anticipatory subject to emphasize a term that is not itself a subject:
強(qiáng)調(diào)主語(yǔ)：作為先行主語(yǔ)來(lái)強(qiáng)調(diào)，但它本身并不是主語(yǔ)：
例句：
It was on Friday that all the snow fell.
是在星期五下雪的

Used to refer to a general condition or state of affairs:
情況狀態(tài)：用于指事情通常的情況或狀態(tài)：
例句：
She couldn`t stand it.
她無(wú)法容忍

Informal Used to refer to something that is the best, the most desirable, or without equal:
【非正式用語(yǔ)】 指代事情：用于指最好的、最渴望得到的或者不平等的事情：
例句：
He thinks he`s it. That steak was really it!
他一直以為自己是最佳人選。那牛排真是不錯(cuò)！

n.（名詞）
Games A player, as in tag, who attempts to find or catch the other players.
【游戲】 捉人者：一個(gè)想要發(fā)現(xiàn)或抓住其它人的游戲者，如在兒童的捉人游戲中
An animal that has been neutered:
被閹割的動(dòng)物：
例句：
The cat is an it.
這只貓已被閹過

來(lái)源：
Middle English
中古英語(yǔ)
from Old English hit * see ko-
源自 古英語(yǔ) hit *參見 ko-