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.
如果字符是个操作符，弹出(pop)操作符，直至遇见开括号(openingparenthesis)、优先级较低的操作符或者同一优先级的右结合符号。
Expressions must not end with an operator, function, comma, or opening parenthesis.
不可以用操作符、函数、逗号或开括号作为表达式结束符。
Operator: Sir, they are our opening hours.
接线员：先生，那是我们的营业时间。
The repetition operator opening character.
重复操作符开始字符。
Accor leveraged its position as the region's largest operator of hotels opening an additional 41 hotels (over 7,000 guest rooms) to the network during the year.
在这一年中，雅高在该地区新开业的酒店达到41家(超过7,000间客房)，进一步巩固了该地区最大酒店运营商的地位。
Accor leveraged its position as the region's largest operator of hotels opening an additional 41 hotels (over 7,000 guest rooms) to the network during the year.
在这一年中，雅高在该地区新开业的酒店达到41家(超过7,000间客房)，进一步巩固了该地区最大酒店运营商的地位。
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