Write a left parenthesis.

写入左括号。

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Every left parenthesis in a string is matched by a right parenthesis.

字符串的左括号都有相应的右括号。

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A blank space should not be used between a function value and its left parenthesis.

函数参数与左括号之间不应该有空格。

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A blank space should not be used between a function value and its left parenthesis.

函数参数与左括号之间不应该有空格。

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