They had suffered a lot of nervous strain and shock.

他们经受了许多神经紧张和震扰。

A further cause of nervous strain was Buller.

另一个令人情绪不安的原因是布勒引起的.

I found that the less I cared whether I spoke well or badly, the less badly I spoke, and gradually the nervous strain diminished almost to a vanishing point.

就这样我发现，我越是不在乎自己讲的如何，我的表现就越好，极度紧张的感觉也渐渐消失了。