necessary

必要的；必需的；必然的英释adjadjsomething that is necessary is what you need to have or need to do

必需品英释nnthings such as food or basic clothes that you need in order to live

1 if necessary,如果必要的话

2 necessary for,所必需；对…是必要的

3 necessary condition,必要条件，充分必要条件

4 when necessary,在必要的时候

5 as necessary,必要时

6 absolutely necessary,绝对必要

7 necessary and sufficient condition,充要条件；必要且充分的条件

8 where necessary,必要时；需要时；必要地方

9 sufficient and necessary condition,充要条件；充分必要条件

10 necessary evil,n. 无可避免之灾祸

11 necessary connection,必然联系

1 The booklet provides all the necessary information about the college..这本小册子提供了关于那所学院的所有必需信息。

2 No further changes were considered necessary..没有必要作出进一步改变。

3 The doctor says it may be necessary for me to have an operation..医生说我可能需要做手术。