The most that can be expected from any model is that it can supply a useful approximation to reality.
对任何模型的最大期望是它能提供一个对现实有用的近似。
I'm not afraid of storms, for I'm learning how to sail my ship.
年轻人不知道什么是谨慎,因此他们尝试不可能的事情——并且一代又一代地实现了它。