The variable name can be any normal identifier, like x.
其中的变量名可以是任何一般的标识符，如x。
Please remember that the prefix is like a variable: its name does not matter.
请记住此前缀类似于一个变量：其名称并不重要。
Variable names can be as long as you like.
变量名称你随便起多长都可以的。
Can I really check an instance variable in a block like this?
我真的可以检查一块这样的实例变量？
Can I really check an instance variable in a block like this?
我真的可以检查一块这样的实例变量？
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