He's not tough enough for a career in sales.

他干推销这一行缺少足够的韧劲。

《牛津词典》

More Americans Say Parents are Not Tough enough.

更多的美国人认为父母尚不足够严厉。

youdao

These plants are not tough enough to survive outside in the winter.

这些植物不够顽强，在冬季根本无法在室外存活。

youdao

The head of the government's mine safety agency acknowledged enforcement of existing laws has not been tough enough.

VOA: standard.2010.04.27

They have also said they are simply not tough enough to withstand the remote and often rough terrain of Scottish hill farms.

BBC: Farmers union welcomes sheep tagging support

Its chairman, Ed Jenkins, has been running a rearguard action against plans to harmonise international accounting standards, because he believes that standards overseas are not tough enough.

ECONOMIST: Draining the pool

But some opposition members feared that the measures were not tough enough to eliminate Golkar's advantage, especially in rural areas where up to 70% of Indonesia's 200m people live.

ECONOMIST: On democracy��s front line