Then one day, when the mother had almost given up hope, there was a knock at the door.

一天，母亲几乎不抱任何希望时，传来了敲门声。两姊妹一起站在门前。

youdao

Now our semester finish , our friends gone, one day I wake up in morning and someone knock our dormitory room and it is teacher Wei and he show me Pakistani flag and asked me how to put it.

一学期结束了，我们的朋友也都回家、回国了，有一天早晨，有人敲响了我们宿舍的门，开门后是卫勇老师，他手里拿着巴基斯坦的国旗，让我们去挂国旗。

youdao

I carefully picked up one egg , lightly knock in Wan Yan on a few times, get up and look, Dan Pi is not broken.

我小心翼翼地拿起一个鸡蛋，轻轻的在碗沿上磕了几下，拿起来一看，蛋皮没有破。

youdao

You can knock one of these nuclei from up to down by bathing it in radio waves of a particular frequency (exactly which frequency depends on the element).

ECONOMIST: The cost of forgetting

Bichel decided he'd pitch one up and knock over my stumps, but I swung and drove loudly past Ricky Ponting and Damien Martyn in the covers (my imagination was into overdrive).

BBC: Facing England's tormentor

So deficit reduction of one percentage point could knock up to 1.7 percentage points off growth.

ECONOMIST: The fund ponders fiscal consolidation