SARAH: But why would a guy be selling new video cameras for twenty dollars?
莎拉:不过为什么有人会卖二十美元一台的新摄影机?
When it comes to love and relationships, why would a guy not say that he loves you?
当谈及爱情和男女朋友关系时,为什么那个男人不说我爱你呢?
And that is why I said that we will have an easy formula for n dS while n and dS taken separately are more complicated.because you would have to actually take the length of a direction of this guy.
这就是为什么ndS一起算时,会有一个简单的公式,而当分别计算n和dS时候,会更复杂的,因为必须取这玩意在某个方向上的长度。
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