物体的加速度与所受的合外力成正比，与物体的质量成反比。加速度的方向与合力的方向相同。
The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
你不喜欢过新年吗？你能够重新开始，每人都有新的机会。
Stay the course. No matter what happens, stick to your program.
生命不止，奋斗不息。