Although it is not necessary to wear expensive clothes, some people like to.

尽管没有必要穿昂贵的衣服，有些人喜欢这样。

It's not necessary to reply to a mass email sent to numerous recipients.

没有必要回复多人接收的群发邮件。

It is not necessary to do sth.

做某事是没有必要的。 没有必要去做某事。

Embellishment and fluff are not necessary.

华丽的润色是完全没有必要的。

Further, proof of actual harm is not necessary.

甚至连实际危害的证据都没有必要出具.

It is not necessary to legislate against gambling.

没有必要立法禁赌.

It is not necessary to give private addresses of children.

这是没有必要给儿童专用地址。

Additional transverse reinforcement is not necessary in the lapping zone.

附加横向钢筋是没有必要在搭接处。

It's not necessary to do that, but it can be quite convenient.

虽然没有必要这样做，但是这样做是很方便的。

You can get Wi-Fi anywhere now, it's not necessary in a bookshop.

现在到处都能连上无线网络，没有必要在书店里上网。