这种材料非常坚韧，即使被粗暴使用也不会轻易损坏。

This material is extremely ___tough and won't easily break even with rough treatment.

你那辆新摩托车看起来真硬朗！

Your new motorcycle looks really ___tough!

这座火山附近的房子是用凝灰岩建造的。

The houses near the volcano are built with ___tuff.