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。
She would knock on the door and say, "Open up."
她敲门，说，“开门。”
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。
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。
These children walk up to houses and knock on the doors.
这些孩子们走到屋前敲门。
They decided to knock up a table tennis match.
他们决定赶快安排一场乒乓球比赛。
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。
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？
Can you knock up a bed out of some old pieces of wood?
你能和几块旧木头拼凑成一张床吗？
Can you knock up a bed out of some old pieces of wood?
你能和几块旧木头拼凑成一张床吗？
应用推荐