plus-minus sign of electric current 电流正负号
combined plus and minus sign 正负复合符号
plus or minus sign 加号或减号 ; 正负号
以上来源于: WordNet
It also details in concrete terms the composition of the three tokens (a plus sign, a minus sign, and an integer) that the parser expects to encounter while scanning through the input stream.
它还详细描述了三个记号(加号、减号和整数)组合的具体项，解析器在扫描整个输入流时希望遇到这些项。
It has changed from a minus sign to a plus sign because of this positive acceleration.
速度的符号已经，由负变正了，可是加速度又还是正的。
Notice the difference: there's a plus sign here;there's a minus sign here.
注意这里的不同：,上面是加号，这里是减号。
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