必要

bì yào shí wèi le jí tǐ lì yì kě yǐ xī shēng gè rén lì yì

必要时为了集体利益，可以牺牲个人利益。

Personal gains are to be given up in the interests of the collective when necessary.

shēn rù tǎo lùn shì bì yào de

深入讨论是必要的。

A further discussion (on the matter) is necessary.

suī rán chē yǒu yòng dàn bù shì bì yào de

虽然车有用，但不是必要的。

A car is useful but not indispensable.

bì yào tiáo jiàn

必要条件

prerequisite

bì yào qiě yǒu yì de bǔ chōng

必要且有益的补充

necessary and useful supplement

rú guǒ bì yào de huà

如果必要的话

if necessary

bù bì yào de kāi zhī

不必要的开支

unnecessary expenditure

shuō bù bì yào de huà

说不必要的话

make needless remarks

diàn duì yú yùn xíng gè zhǒng jī qì hěn bì yào

电对于运行各种机器很必要。

Electricity is necessary to run various machines.

nǐ yǒu bì yào cān jiā zhè ge huì

你有必要参加这个会。

It is necessary for you to attend the meeting.