If you want to add two vectors, you can add the arrows by the rule I gave you or just add the components of x of the two guys to get the component of the sum and likewise for the y.

如果要把两个矢量相加,你可以用我教给你们的箭头相接的方法,或者就将二者的 x 分量相加,得到和矢量的 x 分量,y 方向也是这样

耶鲁公开课 - 基础物理课程节选

The only quibble: There was an add-on component to my service--a sports massage--but my therapist didn't ask whether I had injuries or what sports I play before she commenced.

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In other words it a vertical add-on, or a horizontal core component layer?

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Many financial planners already suggest anticipating a longer lifespan than actuarial tables estimate when investing in retirement, and rising health care costs add to the need to include a growth component in your portfolio.

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