它还为特定库中的符号赋予优先权。
It also gives precedence to the symbols in the library specified.
这实际上表现为一种语法偏好，使斜杠优先于与符号、等号和问号。
All this really does is express a syntax preference for slashes over ampersands, equals signs, and question marks.
如果字符是个操作符，弹出(pop)操作符，直至遇见开括号(opening parenthesis)、优先级较低的操作符或者同一优先级的右结合符号。
If the character is an operator, pop operators until you reach an opening parenthesis, an operator of lower precedence, or a right associative symbol of equal precedence.
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