It doesn't have to be the same

必要───necessary;没有───No,

To join these two pieces of metal, it will be necessary to heat them.───要把这两块金属接合起来, 就要将它们加热.

He believed that in building socialism it was necessary to make thorough plans on behalf of the state.───他认为搞社会主义,要替国家好好打算盘.

They are not afraid to tackle the issues or let the sparks fly when necessary.───他们不怕应对这些问题，也不怕必要时来一番激烈的争论。

From very early on he believed a military revolution was necessary and he has never deviated from that ideological path.───他一早就认为军事革命是必要的，并且从未背离过这一思想路线。

He seems to be making all the arrangements necessary so that he can continue trafficking in drugs when he turns himself in.───他似乎正在做好各种必要安排，以便他自首后还能继续贩毒。

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'll make the necessary arrangements.───我会做一些必要的安排。

She found it necessary to reassert her position.───她觉得有必要重申她的立场。

You can slide the front seats forward if necessary.

I will do so, if necessary.

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It may be necessary to make alternative arrangements.

My money came short of the necessary sum.