... Memory 存储器，内存 ROM Read only Memory 只读存储器，只能读不能写 RAM Random Access Memory 随机存取存储器（内存属于这种存储器） ...
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ROM的特点是只能读不能写，即它存储的内容不会被改变，并且断电后也不会消失。
ROM's characteristic is to read only data, but cannot write data. That is to say, its storage contents will not be rewritten, and will not also disappear though the power is broken off.
可用于赋值操作的右边但不能用于左边的值。右值只能读而不能写。
A value that can be used as the right-hand, but not left-hand side of an assignment. An rvalue may be read but not written.
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