Unlike strings, lists are mutable. When the bracket operator appears on the left side of an assignment, it identifies the element of the list that will be assigned.

和字符串不同的是，列表是可以修改的。方括号运算符放到一个赋值语句的等号左侧的时候，就会把对应位置的列表元素重新赋值。

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Fix bracket in the corresponding hole on the left side of front wall inner plate.

将支架固定在前围内板左侧的对应孔中。

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Fix bracket in the corresponding hole on the left side of front wall inner plate.

将支架固定在前围内板左侧的对应孔中。

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