It is not easy to adapt oneself to new conditions.

要使自己适应新环境是不容易的。

One should adapt oneself to the changed conditions.

我们应当使自己适应变化了的情况。

It is difficult to adapt oneself to sudden changes of temperature.

一个人很难使自己习惯于突然变化的气温。

He added philosophically that one should adapt oneself to the changed conditions.

他富于哲理地补充说，一个人应该适应变化了的情况。

Conditions are changing , and to adapt oneself to the new conditions, one must study.

情况总是在不断变化，要想使自己适应新环境，就得学习。