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1·Sometimes it is necessary to say no.

有时候说“不”是必要的。《柯林斯英汉双解大词典》

2·Repairs are necessary to strengthen the bridge.

这座桥需要加固。《牛津词典》

3·For her, books were as necessary to life as bread.

对她来说，书就像面包一样是生活的必需。《柯林斯英汉双解大词典》

4·It has been found necessary to make some cuts in the text.

已发现有必要对文章作些删节。《柯林斯英汉双解大词典》

5·It is not always necessary to gut the fish prior to freezing.

在冷冻鱼之前没有必要总是取出其内脏。《柯林斯英汉双解大词典》

6·They've been deprived of the fuel necessary to heat their homes.

他们无法得到住房取暖必需的燃料。《柯林斯英汉双解大词典》

7·It may also be necessary to get a new appraisal of the property.

可能还需要对该房产做个新的估价。《柯林斯英汉双解大词典》

8·It is always necessary to have regard to the terms of the contract.

记住合同条款总是必要的。《牛津词典》

9·He had the ruthless streak necessary to carry him into the cabinet.

他有着跻身内阁所必需的冷酷品性。《柯林斯英汉双解大词典》

10·I kept the engine running because it might be necessary to leave fast.

我让发动机一直开着，因为可能需要快速离开。《柯林斯英汉双解大词典》