Another thing that the notation suggests we can do, and they claim we can do, is divide everything by some variable that everybody depends on.
这个记号告诉我们可以做的，要求我们做的，就是用所有这一切都依赖的变量，来除以这个式子。
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Variable names must begin with a letter, which makes it easy for Velocity to distinguish variable names from currency notation within a template (for instance, $100 cannot be a variable name).