tough

The reptile's skin is tough and scaly.

这种爬行动物的皮肤坚韧并带有鳞片。

Also last year, Farrant and colleagues published a detailed molecular study of another candidate, Xerophyta viscosa, a tough-as-nail South African plant with lily-like flowers, and she says that a genome is on the way.

同样是在去年，费朗和同事发表了一份关于另一种候选耐旱植物维柯萨的详细分子研究报告，这种植物是一种坚韧如指甲的南非植物，开着像百合一样的花，她说该植物的基因组也正在研究当中。

It's about time teachers started to get tough with bullies.

现在教师该对横行霸道的学生开始采取严厉措施了。

The reason London taxi drivers are so efficient is that they all have gone through a very tough training period to get the special taxi driving license.

伦敦的出租车司机之所以效率这么高，是因为他们都经过了一段非常严格的训练才获得了专门的出租车驾驶执照。

To those students who protest this tough-love teaching style: you'll thank me later.

对于那些反对这种恩威并施的教学方式的学生：你以后会感谢我的。

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

他干推销这一行缺少足够的韧劲。

Give yourself the resources to be tough by creating internal and external recovery periods.

通过创造内部和外部的恢复期，为自己创造能变得坚强的动力来源。

She's a tough customer.

她是个有主见的人。

He is a bit of a tough character and she is rather selfish.

他性格有点强硬，而她则相当自私。