So that vector is called a "Null vector."

这种矢量就叫做"零矢量"

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It's very clear that if you want to take A and ask, "What should I add to A so I get the null vector?"

显然,你们会拿 A 来问,"拿什么来加矢量 A 可以得到零矢量呢"

耶鲁公开课 - 基础物理课程节选