When people live together, rules are always necessary.
＂当人们生活在一起时，总需要规定一些制度。＂。
Man and nature live in peace when necessary.
人与自然和平相处时必须的。
It is also necessary for the body to live.
盐也是人体生命的必须品。
Cholesterol is necessary for us to live.
胆固醇是人们生活所必需的。
If you sell your house, it will be necessary to find somewhere else to live.
如果你把房子卖了，就势必要另找住处。
If you sell your house, it will be necessary to find somewhere else to live.
如果你把房子卖了，就势必要另找住处。
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