她的床垫太硬，睡起来不舒服。

Tā de chuángdiàn tài yìng, shuì qǐlái bù shūfu.

Her mattress is too hard, making it uncomfortable to sleep.

这个橡皮很硬，擦不掉铅笔的痕迹。

Zhège xiàngpí hěn yìng, cā bù diào qiānbǐ de hénjì.

This eraser is very hard and can't erase pencil marks.

这个果实表面很硬，但里面很软。

Zhège guǒshí biǎomiàn hěn yìng, dàn lǐmiàn hěn ruǎn.

The surface of this fruit is hard, but inside it's soft.