Yes, I heard him knock three times.
是的，我听到他敲了三下。
Yes, I did. I heard him knock three times.
是的，我听见他敲了三下。
I heard someone knock three times just now.
刚才我听见有人敲了三次门。
If you want to know a secret, knock three times.
如果你想知道一个秘密，敲三下门。
He also knows how to finesse his way into an interview room, Japanese style: You must knock three times, etiquette experts say - not once, not twice.
他还知道如何巧妙地进入面试的房间，用的是日本风格：礼仪专家说，必须敲三下门，不是一下，也不是两下。
I heard someone knock (at the door) three times.
我听见有人敲过三次门。
I heard someone knock (at the door) three times.
我听见有人敲过三次门。
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