We are going to have coefficients on this, and they will add up.

我们添加一些系数以后，就把他们加起来。

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He said, imagine that we could get people to have a big town meeting for the whole world, and he said, before they were born.

他说，设想我们可以,当人未出生的时候就将他们聚集起来，开一个共同商讨世界的人民大会。

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That's clear. If I add them, I'll get a vector parallel to i with lengths Ax + Bx.

这很明显 如果把他们加起来,就得到一个平行于 i,模长为 Ax + Bx 的矢量

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