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necessary

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Repairs are necessary to strengthen the bridge.(这座桥需要加固。)
I do not wish to complicate the task more than is necessary.(我不想使这项任务不必要地复杂化。)
I can take the car if necessary.(如果必要的话，我可以乘汽车去。)
Sometimes it is necessary to say no.(有时候说“不”是必要的。)
She searched her desk for the necessary information.(她在她的书桌里搜寻必要的资料。)
Some adjustment of the lens may be necessary.(可能需要调整一下镜头。)
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。)
Higher taxes may be a necessary evil.(提高税率虽不是件令人愉快的事，但可能是必要的。)
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。)
If necessary , you can contact me at home.(必要的话，我在家时你也可以和我联系。)

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