1、And I probably have a negative sign somewhere.
所以在這里可能會有個負號。

2、The negative sign indicates that this is compressive stress.
負面的跡象表明，這是壓應力。

3、And I've reversed the fraction here because of the negative sign here.
我交換了分子和分母，因為這里有個負號。

negative sign翻譯