Who knocks at this late hour?

这么晚了，是谁来敲门？

With her five gold rings at the door she knocks: "Are you within, good Mistress Fox?"

她戴着五个金戒指敲门：“你在吗，狐狸太太？”

He knocks out five books a year.

他一年轻松写出五本书。

He knocks off three novels a year.

他一年赶出三部小说。

Ignoring feelings of tiredness knocks our body clocks out of kilter.

忽视疲劳感会打乱我们的生物钟。

The bags have tough exterior materials to protect against knocks, rain, and dust.

这些袋子结实的外层材料有防撞、防雨、防尘的作用。

The medicine knocks out the staph.

这药能消灭葡萄球菌。

When he passes the desks, he often knocks my books off the desks.

当他路过这些书桌时，他总是把我的书从桌上撞掉。

Children are ever ready, when novelty knocks, to desert their dearest ones.

当新奇的事情发生时，孩子宁愿抛弃他们最亲爱的人。

For a new life, the eagle knocks its beak against a rock until it pulls its beak out.

为了获得新生活，鹰会用喙撞击岩石，直到它把喙拔出来。

If someone on a hike knocks a couple of rocks over, they could be unwittingly destroying a microclimate that an animal or organism relies on.

如果有人在徒步旅行中撞倒了几块岩石，他们可能在不知不觉中破坏了动物或有机体赖以生存的小气候。

Opportunity knocks but once.

良机难再。

Did you hear the knocks at the door?

你听到敲门声了吗？

He knocks on the door. No one answers.

他敲了敲门，无人应门。

She knocks the dust out of her coat.

她打掉外套上的尘土。

What knocks me most is his ignorance.

最让我吃惊的是他的无知。

He knocks on a door.

他敲响一扇门。

The portable device easily knocks down.

这种轻便装置容易拆卸。

Luck is when opportunity knocks and you answer.

运气就是你对降临的良机的回应。

Maria: (knocks on the room door) May I come in, madam?

玛利亚：(敲房间门)女士，我可以进来吗？