The only thing it cannot do is call the put method, and this is because it cannot verify the safety of such an operation without knowing the type parameter t for this Box instance.

它惟一不能做的事是调用put方法，这是因为在不知道该Box实例的类型参数t的情况下它不能检验这个操作的安全性。

youdao

The only thing it cannot do is call the put method, and this is because it cannot verify the safety of such an operation without knowing the type parameter t for this Box instance.

它惟一不能做的事是调用put方法，这是因为在不知道该Box实例的类型参数t的情况下它不能检验这个操作的安全性。

youdao