我们必须知道，狮子生活在冬天气温会降到零度以下的国家是不自然的。

We have to learn that it is not natural for a lion to live in a country where, in winter, the temperature can fall below zero.

我们必须知道，狮子生活在一个冬天气温会降到零度以下的国家是不自然的。

We have to learn that it is not natural for a lion to be living in a country where, in winter, the temperature can fall below zero.

但这样的设计并不自然。

It was not a natural fit.

长时间保持不自然的坐姿。

Sitting in an unnatural posture for a long time。

她的玩笑使他脸色不自然。

Her joke put him out of countenance.

长时间保持不自然的坐姿。

Sitting in an unnatural posture for a long time.

那个律师不自然地点头示意。

The lawyer nodded a stiff greeting.

她说这件事时，笑得不自然。

She said it with her disagreeably pleasant laugh.

在这方面他总是显得不自然。

He was always uneasy on this score .

他们很不自然地走进了解剖室。

Mechanically they entered the room.