真正的友情在困难时才会被考验。
我不在乎别人怎么看我,我在乎我怎么看自己。
Parental investment is the key to understanding sex differences in mating strategies.
价格被遗忘后,质量仍会被长久记住。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
The world is full of signs, but we have forgotten how to read them.