然后调用new来实例化该模板，创建一个新对象。

Then, you call new to instantiate that template, creating a new object.

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如果在会话中找不到对象，它就创建一个新对象。

If it cannot find the object in the session it creates a new one.

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要创建一个新对象(这里是将返回的字符串)，首先分配对象，然后初始化对象。

To create a new object (in this case, the string that will be returned), first alloc the object and then initialize it.

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