Think about it: without this rule, people would stand on the escalator at random. Even if the people rushing up were to cry "Excuse me" all the way, who knows how many people would be knocked over?
试想无此约定，人们随意站满了电梯，有急事的人要想跑上，即使一路高喊“劳驾”，也不知要碰倒多少人呢。
Set the barometer in a spot out of direct sunlight, where it can be observed but won't get knocked over.
设置了一个晴雨表当场被击倒在了阳光直射，在那里可以观测到，但不会。
However, he was not to be discouraged; he daubed his face over brown and black; pulled his cap over his ears, and knocked at the door.
不过王子并不因此失望。他把自己的脑袋涂成棕里透黑，把帽子拉下来盖住眉毛，于是就来敲门。
She knocked over three vases and seemed to be all thumbs.
她打翻了三个花瓶，看来是个笨手笨脚的人。
You can be knocked down over and over again, but you keep coming up.
你可能会一次次被打倒，但是你会再一次爬起来。
You can be knocked down over and over again, but you keep coming up.
你可能会一次次被打倒，但是你会再一次爬起来。
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