基本物理学理论上，空气越稀薄情况下，任何物体的耐性都会减少，因此球路也会因海拔高度不同而有所变化。

It's the basic physics that the air is thinner and the resistance to any projectile is less so the flight path of the ball will be different at high altitude.

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描述物体运动基本方法；描述质点运动基本物理量和运动方法；运动的叠加原理和相对运动。

Basic method to describe motion of body; basic physics quantities and method to describe the particle motion; the supposition principle of motion and relative motion.

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蛋白质是生物体中必不可少的基本物质，在生物体的生命活动中起着重要的作用。

Protein is an essential material of organisms, it plays an important role in life activities.

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So you cannot use the formula once it hits the ground because once it hits the ground, the fundamental premise that a was a constant of -9.8 or -10 is wrong.

当物体落地以后,该公式就不适用了,因为当物体落地后,公式的基本前提——,加速度为常数-9.8或-10——就不成立了

耶鲁公开课 - 基础物理课程节选

So, the two most elementary ideas you learn are what is the average velocity of an object, as then ordered by the symbol v-bar.

你们学过的两个最基本的概念是,物体的平均速度,用"v拔"表示

耶鲁公开课 - 基础物理课程节选