这种材料既轻又坚韧，非常适合做运动鞋的鞋底。

Zhè zhǒng cáiliào jì qīng yòu jiānrèn, fēicháng shìhé zuò yùndòngxié de xiédǐ.

This material is both light and tough, very suitable for making sports shoe soles.

她性格坚韧，不轻易放弃。

Tā xìnggé jiānrèn, bù qīngyì fàngqì.

She has a tenacious character and doesn't give up easily.

只有内心足够坚韧，才能在失败后重新站起来。

Zhǐyǒu nèixīn zúgòu jiānrèn, cáinéng zài shībài hòu chóngxīn zhàn qǐlai.

Only with a sufficiently strong heart can one stand up again after failure.