positive and negative numbers
This should not be empty, so you can distinguish positive and negative numbers.
它不能为空, 这样您才能分辨正数和负数。 通常它被设为减号 (-) 。
—— 给力词典精选The following example shows values that include both positive and negative numbers.
下面的示例演示包含正数和负数的值。
—— 给力词典精选The +´s and -´s are positive and negative respectively.
加号和减号分别标明正数和负数。
—— 给力词典精选