1·No sooner had I sat down than there was a loud knock on the door.
我刚坐下就有人大声敲门。
—— 《牛津词典》
2·He gave the noisy bird a knock on his beak, and walked on.
他在这只吵闹的鸟的嘴上敲了敲，继续往前走。
3·They knock on their neighbours' doors and shout "trick or treat".
他们敲了他们邻居家的门，然后喊着“不给糖就使坏”。
4·If there is anything I can do for you, you just knock on my door.
如果有需要我帮忙的地方，直接敲我的门。
5·They knock on people's doors and shout "Trick or treat!" for sweets.
他们敲邻居的并说“不给糖就捣乱”来得到糖果。
6·It takes four or five months to get a mortgage company so upset that they knock on your door.
在四五个月未还款后，抵押贷款公司就会沮丧地来敲你的门。
7·On Halloween, children would usually wear strange costumes, knock on their neighbours' doors and threaten them with "trick or treat".
万圣节的时候，孩子们会穿上古怪的服装去敲邻居的门，威胁他们说“不给糖就捣乱”。
8·He got a nasty knock on the head.
他头部遭到重重一击。
—— 《牛津词典》
9·There was a sharp knock on the door.
敲门声大作。
—— 《牛津词典》
10·I got it all taken care of, knock on wood.
我把它各个方面都照顾到了，但愿好运仍在。
—— 《柯林斯英汉双解大词典》