用第三人称写(“含水层涵盖1000平方公里”)，或第一人称复数(“从这个等式我们看到，加速度与力成正比”)。
Write in the third person (" the aquifer covers 1000 square kilometers ") or the first person plural (" We see from this equation that acceleration is proportional to force ").
地球也会坠向苹果-，因此地球上的力与地球的质量相等，再乘以地球的加速度。
Well, the earth is going to fall towards the apple — So the force on the earth is the mass of the earth times the acceleration of the earth.
这一也十分重要-，加速度与力方向相同。
That's also important — the acceleration is in the direction of the force.
加速度才为零,写出来就是：我给它的力,与重力之合力等于零。
Only now is there no acceleration so I can write down that force of Walter Lewin plus the force of gravity equals zero.
经过一些时间的自由降落后，落体运动得很快，以至空气拽力(阻力)与落体的重量相等，于是就没有加速度了。
After some time of uninterrupted fall, the body is moving so rapidly that the drag of the air is as great as the weight of the body, so that there is no acceleration.
力是用质量与加速度相乘定义的。
图表显示与时间相对的摩擦力、位置、速率和加速度。
Charts show the forces, position, velocity, and acceleration vs. time.
译文：加速度是由于受到作用在物体（或质量）上的非平衡的作用（力）而产生的，其与力的大小成正比，方向沿力的方向。
The acceleration produced by an unbalanced force acting on an object (or mass) is directly proportional to the magnitude of the force and in the direction of the force.
本论文主要研究内容：首先，设计了基于PSD的激光加速度计系统的结构，针对此结构推导了该数字式力平衡加速度计输出脉冲差与输入加速度之间的关系。
Firstly, the structure of the laser accelerometer based on PSD are designed in this dissertation. The relation between the output pulse difference and the input acceleration is derived.
肌肉最大收缩力与负荷的大小成正比；肌肉收缩的最大加速度可能是个常数。
The maximum contraction force of muscle is directly proportional to it's load and the contraction acceleration of muscle may be a fixed number.
肌肉最大收缩力与负荷的大小成正比；肌肉收缩的最大加速度可能是个常数。
The maximum contraction force of muscle is directly proportional to it's load and the contraction acceleration of muscle may be a fixed number.
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