A piece of bread 他停下来回头看 » He stopped and looked back 即对齿轮的质量进行优化，假定齿轮材料密度均匀，则目标函数可等价转化为齿轮体积的最小化。
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Remember the street again, saw a very much like you guys, I stopped, looked back the number of times the only hope that one of his turn around and let me see her face, for he and you really like.
记得上一次逛街，看见一个与你很像的男生，我停下了脚步，多少次的回头只希望一个他的转身让我看到她的面容，因为他与你真的好像。
He stopped short and looked back.
他突然止步，回过头朝后面瞧。
He stopped for a moment and looked back and saw in the reflection from the street light the great tail of the fish standing up well behind the skiff's stern.
他停了一会儿，回头一望，在街灯的反光中，看见那鱼的大尾巴直竖在小船船梢后边。
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