We can distinguish the blurred shapes and colours we see at a distance only because of the capacities of our eyes.
The best investment we can make is in the health of future generations.
只要现在能够停下来休息,那么就立刻停下来休息;如果要等到一切事情都办妥时再停下来,那么这样的时刻永远也不可能等到。
The study of black holes has revolutionized our understanding of space and time.