Travell
n. 趕畜；旅行；行駛速度
??? 情景例句
He said they need a new book of photographs,
他說他公司需要一本新的攝影集，
I'm too slow.
我太慢。
It is fairly clear that sleeping period must have some function,
很清楚，睡眠必然具有某種作用。