... intrinsic-minus sign 手内在肌阴性征 minus sign negative 负号否定 combined plus and minus sign 正负复合符号 ...
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For patterns with a leading minus sign (negative prefix), truncation occurs at the point of a nondigit character, including embedded minus signs.
对于带前置负号(负前缀)的模式,截断发生在非数字字符的点(包括了内嵌的负号)。
If the integer is negative, you write a minus sign before the number, just as in mathematics.
如果是一个负数,在数字前面加上“-”即可,就和数学中是一样的。
If the pattern specifies a leading minus sign for negative input, a trailing minus sign is ignored.
如果该模式指定前置负号为负输入,后置负号将被忽略。
It says, if you pull it to the right, so that x is positive, the spring will exert a force which is in the negative direction; that's why you have a minus sign.
就是说,如果你向右拉,x 取正值,弹簧产生的力方向为负,这就是这里用负号的原因
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