need

1.需要；必需to require sth/sb because they are essential or very important, not just because you would like to have them

2.~ to do sth（表示应该或不得不做）有必要used to show what you should or have to do

need (to have) your head examined

发疯to be crazy

1.~ (not) do sth（表示没有必要或询问是否有必要）需要used to state that sth is/was not necessary or that only very little is/was necessary; used to ask if sth is/was necessary

1.[sing][u]需要；必须a situation when sth is necessary or must be done

2.[c][u]特别需要；迫切要求a strong feeling that you want sb/sth or must have sth

3.[c][usupl]需要的事物；欲望the things that sb requires in order to live in a comfortable way or achieve what they want

4.[u]（食物、钱或生活来源的）短缺，缺乏the state of not having enough food, money or support

if need be

如果需要的话；有必要的话if necessary

1.必要,需要

2.需求;需用的东西

3.缺乏,不足

4.贫穷

5.危急的时候,一旦有事的时候

1.要,需要,必须,有...的必要

2.〈古〉需要

3.生活贫困

1.不得不,必须

2.She need not go. 这句话,口语常说作 She doesn't need [have] to go

1.a situation in which it is necessary for something to be done; something that you need in order to be healthy, comfortable, successful, etc.

1.if you need something, you must have it because it is necessary; used for saying whether it is necessary to do something; used for saying whether it is necessary for a particular situation to exist

2.used for emphasizing that something should be done