咬紧牙关

die hard───难改掉；难断气

bit part───n.小角色

bite back───咬回；急忙收回要说的话；抑制

blow hard───n.吹牛大家；adj.吹牛的；唠唠叨叨的

die-hard───难改掉；难断气

diehard───adj.顽固的，因循守旧的；n.顽固分子，死硬派

bitter herb───苦菜花；苦草（制苦味酒和饮料用，逾越节家宴凉拌菜）

fire hazard───火灾；火灾隐患

minute hand───钟表的分针

You have to bite hard to get through the peel of this apple.───你要使劲咬才能咬透这个苹果的皮。

Patient: it has been like this since I tried to bite something hard.───病人：有一次我咬了硬的东西之后发生的。

But the iron jaws still bite hard with the resolve, And the resolve itself bites hard the enemy.───但铁颚依旧紧咬着决心，而决心又始终紧咬着敌人。

He sometimes gets agitated by his swelling gums, which makes him want to bite hard objects & people.───他有时候因为长牙齿，所以牙床胀痛，想去咬人或去咬一些坚硬的东西。