We are the temporary custodians of an ancient genetic legacy.
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 test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.
Love is or it ain't. Thin love ain't love at all.