函数曲面可由解析函数表达式来表达，建模方便。
The function surface can be expressed by analytic expression and constructed easily.
我们可以看到，当标示符被省略的时候，这样的结构只能是一个函数表达式。
We can see that when identifier is omitted, that "something" can only be an expression.
我们可以看到，当标示符被省略的时候，这样的结构只能是一个函数表达式。
We can see that when identifier is omitted, that "something" can only be an expression.
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