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- We heard repeated knocks on the door. 我们多次听到敲门声
- There came the 2 P.M. knock on the door. 下午两点钟来客的敲门声响了。
- There was a sharp knock on the door. 敲门声大作。
- Then came a knock on the door and he cowered away. 突然有敲门的声音，他吓得躲开了。
- One morning there was a knock on the door. 一天早上有人敲门。
- A knock on the door awakened her. 敲门声把她惊醒。
- Then came the knock on the door. 然后传来了敲门的声音。
- A sudden sharp knock on the door startled her. 急遽的敲门声把她吓了一跳。
- Please do not enter before knocking on the door. 进来前请先敲门。
- Knock on the door before you enter. 进屋之前要先敲门。
- I heard footsteps, then a knock on the door. 我听到脚步声，随后是敲门的声音。
- There was a loud knock on the door just now. 刚才有一声响亮的敲门声。
- There's a knock on the door and it's Paul. 敲门声响起,是保罗。
- Don't knock on the door, please. 请不要敲门。
- A man in his 30s knocked on the door. 敲门的是一个30来岁的先生。
- At that moment, we heard a knock on the door. 正在那时,我们听到敲门声。
- Always knock on the door before you enter. 进入前要先敲门。
- So has anyone dared knock on the door? 那现在有人敢敲你办公室的门么?
- He knocked on the door with some trepidation. 他敲门时有点儿战战兢兢。
- I knocked on the door but there was no response. 我敲了门，可是没有回应。
