She would knock on the door and say, "Open up."
她敲门，说，“开门。”
The ability of some ecosystems to clean themselves up can also cause knock-on problems.
生态系统的自我净化能力也会引起连锁反应。
I wanna knock those gates right now, and I will say sign us both up.
我想现在就去敲他们的门，我想告诉他们把咱俩都签了吧。
Life will knock us down, but we can choose whether or not to stand back up.
生活会把我们打趴下，但我们可以选择是否重新站起来。
These children walk up to houses and knock on the doors.
这些孩子们走到屋前敲门。
What are we supposed to do-walk up and knock on the door?
我们还能干什么呢——走上前去敲门？
What are we supposed to do-walk up and knock on the door?
我们还能干什么呢——走上前去敲门？
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