He gritted his teeth and knocked.

他咬咬牙，敲响了房门。

The idiom is: by the skin of one's teeth.

咬牙切。

I daresay you'll find you can, ' said Professor McGonagall through tightly gritted teeth.

麦格教授紧咬牙根。

He grinded his teeth and scowled.

他咬牙切，怒目而视。

He ground his teeth and looked fierecely at the traitor.

他咬牙切，恶习狠狠盯着叛徒。

How the other red hats would gnash their teeth in envy.

其他红衣主教该怎样的咬牙切嫉妒不已啊。

" Dumbledore happens to trust me, " said Snape through clenched teeth.

“邓布利多恰好很信任，”斯内普咬牙切。

I'm on the new captain's hit list and my partner's.

那位新警长恨恨得咬牙切 那位搭档也是。

I told him if he didn't bite the hygienist, I'd take him for ice cream.

跟他，如果他不咬牙医就带他去吃冰淇淋。

“I bet Dumbledore saw right through you, ” said Harry, his teeth gritted.

“敢邓布利多早把你看透了。” 哈利咬牙切。

" All right." Ron gritted his teeth and stepped carefully over the dog's legs.

“好吧。”罗恩咬了咬牙，小心从大狗的腿上跨过去。

What about some of the characters who make office life so teeth-grinding?

对于那些让你在办公室生活中咬牙切的角色，又该怎么办呢？

They squirmed, kicked, flailed their sharp little fists, and gnashed their teeth.

他们扭动着身体，两脚乱蹬，挥着尖尖的小拳头，咬牙切。

" I hated it, " she said bitterly. " I loathed it."

" 讨厌它，" 她咬牙切，" 厌恶它。"

" Oh, 'ow I 'ate 'im! 'Ow I 'ate 'im" ! he gritted out.

" 恨死他了！ 恨死他了！" 他咬牙切。

As they went past the blue car, White Satin did not shake his head or snap his teeth.

他们经过蓝汽车时，“白色锦缎”没有摇头或咬牙。

I closed my eyes and inhaled slowly through my nose, aware that I was gritting my teeth.

闭上眼睛，鼻子慢慢吸着气，意识到自己在咬牙切了。

It's more about the pain cause it hurts but you just kind of grind your teeth and bear it.

最糟糕的还是疼痛，纹身时非常疼，不过只要咬牙坚持就好了。

And I'm so grateful that we have stuck it out this long and I see us together another gazillion?

也感激们能一直咬牙坚持到现在，还看到了们一起庆祝许多次纪念日。

Every situation that made me feel uncomfortable, every situation that I was intimidated by I jumped on it.

每一个让感到不舒服的情况，每一个让感到害怕的情况，都会咬牙而上。