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.
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 social responsibility of enterprises lies not only in creating profits but also in promoting sustainable development of the industry.
The history of life is written in A, T, C, and G.
"Every family has its secrets, but some secrets are buried deeper than others."