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.
大西洋两岸大陆的契合,是大陆漂移理论最引人注目且最关键的验证。
没有实用性的创新只是噪音,农民需要真正的解决方案。
"The best revenge is massive success."