If you feel tight and need to stretch before, do it after you've warmed up with a slow five or ten minute jog.
如果你觉得肌肉紧绷,需要先做个拉伸,至少要做个5到10分钟的慢跑作为热身。
Tom's old computer ran fast five years ago, but little by little it became really slow.
汤姆的旧电脑在五年前还运行得很快,但渐渐地它变得非常慢。
Each of the campers walks at a different speed. One can cross the bridge in one minute, another in two, the third in five, and the slow poke takes 10 to cross.
这四个人过索桥的速度都不一样,第一个走过索桥需要1分钟,第二个2分钟,第三个5分钟,最慢的那个要10分钟。
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