Most adults, when they fall down, make a big deal out of it and don't even make a second attempt.
大多数成年人，当他们摔倒了，会对此大惊小怪，甚至不会再试一次。
His strange habit makes sense when you consider that he's an environmental scientist who studies how to reduce litter, including things that fall off garbage trucks as they drive down the road.
他是一位研究如何减少垃圾的环境科学家，其中包括研究减少垃圾车行驶时掉下来的东西，当你考虑到这一点，自然就能明白他为什么会养成这种奇怪的习惯了。
Babies often fall down when they learn to walk.
婴儿在学走路时经常摔倒。
When they fall over, they slide a long way down the hill!
当他们落下时，就会沿着山坡滑行很长的一段路。
Babies often fall down when they are learning to walk.
婴儿在学走路时经常摔倒。
What they are trying to say is that bits fall of machines-especially when they start to break down.
作者们试图说的是，颗粒从机器上脱落下来，特别当机器开始损坏时。
What they are trying to say is that bits fall off machines-especially when they start to break down.
作者们试图说的是，颗粒从机器上脱落下来，特别当机器开始损坏时。
What they are trying to say is that bits fall off machines-especially when they start to break down.
作者们试图说的是，颗粒从机器上脱落下来，特别当机器开始损坏时。
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