“负号”造句
他似乎把
负号误作正号了.
He seems to have mistaken a minus for a plus.
出现
负号的原因与 33-2 节所讲的相同.
The reason for the minus sign is the same as in Section 33 - 2 .
这个
负号表示这个力总是和速度的方向相反.
The negative sign describes the fact that this is always opposite to the velocity.