It has an internal state variable that starts with the value EMPTY and becomes FULL as soon as an object is put into it.
它有一个内部状态变量，该变量的起始值为EMPTY，只要放进一个对象，该变量的值就变成FULL了。
It has an internal state variable that starts with the value EMPTY and becomes FULL as soon as an object is put into it.
它有一个内部状态变量，该变量的起始值为EMPTY，只要放进一个对象，该变量的值就变成FULL了。
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