So when you use a regular light bulb for reading before bed you can throw off the levels of melatonin which in turn makes it harder to fall asleep.
如果你睡前阅读用的是普通灯泡，褪黑激素的分泌被扰乱，你就会比较难以入睡。
A bed of gravel on the outside of corners designed with the aim of bringing cars that fall off the circuit to a halt.
在弯道外侧一般要设计砂石带，可以使从赛道甩出的赛车停止下来，总的说就是起到缓冲作用。
You could fall off the bed and bump your head!
你能从床上落下并且碰你的头“！
Don't fall off the bed and bump your head!
我在床上跳呀跳呀，我掉下来碰了我的头。
Don't fall off the bed and bump your head!
我在床上跳呀跳呀，我掉下来碰了我的头。
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