value initialization（值初始化）：当给定容器的长度，但没有显式提供元素的初始式时，对容器元素进行的初始化。元素被初始化为一个编译器产生的值的副本。
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The main disadvantage of lazy initialization is your code becomes more complex because you need to check to see if the attribute has been defined yet and, if not, obtain its value.
延迟初始化的主要弊端是，由于要查看属性是否已定义，如果没有，则得到它的值，这会使代码变得更复杂。
The main disadvantage of lazy initialization is that your code becomes more complex because you need to check to see if the attribute has been defined yet and, if not, obtain its value.
延迟初始化的主要缺点是：代码将变得更复杂，因为需要查看是否定义了属性，如果还未定义，则要获取属性值。
On the next screen, enter the Initialization Parameters SECRET_KEY and the value as the secret key in our initial steps of Facebook application creation.
在下一个屏幕上，输入初始化参数SECRET_KEY以及在Facebook应用程序创建的初始步骤中作为secret键的值。
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