1.But there is no letup in the fighting.

但是战斗并没有停止。

2.But he felt no letup in the cold precision of his being.

但他对自己冷酷的并没有感到松懈。机翻

3.It's a recognized syndrome that can go on for a year or more without letup.

这是一种公认​​的综症，可以持续一年时间而不间断。机翻

4.There's no sign of a letup in eastern Australia where firefighters are continuing to battle numerous bush fires in the states of New South Wales and Queensland.

在澳大利亚东部，消防员们仍在持续与新南威尔士州和昆士兰州的丛林大火斗争，大火尚没有减弱的迹象。