A lever lets you use less force to move something. You use levers all the time. You can use a lever to open a can of paint. First you put a metal stick under the lid. Then you press down on the stick. The lid will lift up. Some examples of levers are seesaws, forks, and scissors.
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lets是let's吗具体什么意思
Ko姐 回复 @陆_4q: 不是,这里的是倒数第三人称动词的变化
好
老师说的号码键是哪个单词,星号钱是star。pond?没听清楚了
Ko姐 回复 @覌照: # = pound key