举起你的左手和右手 伸出拇指和食指成90°,类似于做成一把枪的样子,大拇指和大地平行 然后你就会发现,左手是一个大写的l 右手是一个反过来的l 因为,左手做出l,所以left是左~ \left 和 \right,还有 \middle 只是机械地根据 \left 和 \right 内的内容高度缩放定界符;缩放的高度保持与内容相同。然而事实上,有一些情况我们需要的并不是完全相等的高度。 比如,对于大型运算符的运. (被留下) 例: i left my child in the car.
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这里left是过去分词短语,作定语,修饰people, 放在被修饰词之后,它的作用相当于一个定语从句: i'm one of the few people who are left.
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