Plus and minus signs were used in 1514 in Holland.
1514年，荷兰开始使用加号和减号。
These correspond to the plus and minus signs that control code folding.
这些小三角对应于控制代码合并的加减符号。
It can include variables, constants, and operating symbols, such as plus and minus signs.
它能包含变量、常量、运算符，例如加号和减号。
Click on the plus and minus signs to adjust the proportions between extracts in your new fragrance.
点击正负标志调整在你的新香水中提取物的比例。
By convention, these graphics are usually triangles that point to the right for closed or down for open; or plus and minus signs, where plus means closed and minus means open.
按照惯例，通常使用向右的三角形取代closed，向下的三角形取代open；也可使用加减号，加号表示closed，减号表示open。
By convention, these graphics are usually triangles that point to the right for closed or down for open; or plus and minus signs, where plus means closed and minus means open.
按照惯例，通常使用向右的三角形取代closed，向下的三角形取代open；也可使用加减号，加号表示closed，减号表示open。
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