使坚硬

hardens up───使坚硬

hardened up───使坚硬

sharpen up───使……更敏锐；认真思考

hard up───缺钱；短缺

hardening up───使坚硬

to harden up───硬化

harden off───使受冷而变得耐寒

smarten up───变潇洒；变漂亮

bidden up───v.抬价

after eating - as enamel on teeth is softened after eating especially with sugary foods - it's best to wait an hour before brushing which allows the tooth to harden up more.───进食后——尤其是吃了甜食后——牙釉质会软化，所以最好过一个小时等待牙釉质恢复后再刷牙。

You just have to harden up a little bit.───你必须要更刻苦一些.

Harden up a little, we need more speed.───把帆索拉紧一点，我们需要加快速度。

Once the plastics harden and are removed from the molds, the fingers are ready to be hooked up to a base.───一旦塑料变硬，并去除掉模具，手指就可以连接到基座上了。