There was an unnatural silence and then a scream.

an unnatural death (= one not from natural causes)

非正常死亡

Almost half of all unnatural deaths are related to alcohol, a study has found.

一项研究发现几乎半数的非自然死亡都与酒精有关.

She was, not unnaturally , very surprised at the news.

这消息自然让她大吃一惊。

As to the charge of unnatural, I could easily answer it to myself.

至于违背天理这个罪状, 我自己倒是很容易答辩的.

unnatural sexual practices

变态的性行为

Try to avoid shouting or speaking unnaturally.

尽量不要高声喧哗或是不自然地讲话。

He expected , not unnaturally, that I would return the money.

他理所当然地以为我会还钱.

The street was unnaturally quiet.

街上安静得有些异常。

The house was unnaturally silent.

房子里异常安静。

Her voice sounded unnaturally loud.

她的嗓音很响亮,但是有点反常.

Why were they not suspicious of the unnaturally consistent returns?

为什么他们不怀疑这种不正常的持续收益?

Her attitude at this sentimental crisis seemed to him unnaturally passive.

在这个感情危机的时刻,她的态度显得异常地逆来顺受.

To the doctor she seemed unnaturally composed.

从医生看,她不免有些矫揉造作.

The vale was wrapped in a dim atomosphere of unnaturalness.

峡谷沉浸在一种不自然的朦胧气氛里.

Some parents worry unnecessarily about their children.

有些父母不必要地为孩子担心.

Not only this, she read them aloud and put down quite unnecessarily words we already knew.

同时读着,同时连教师随手写的、已经不必要的、读过的熟字, 她也记了下来.

They have pulled out patients' teeth unnecessarily.

他们毫无必要地拔掉了病人的牙。

Don't cloud the issue, ie Don't make it unnecessarily complicated.

不要把问题搞得复杂化.

Otherwise, it will be lost – and at an unnecessarily high cost.

否则, 这仗就会打输——而且付出的是不必要的高昂代价.

I don't want to bother anybody unnecessarily.

没必要的话,我不想打扰任何人.