真实的生活当然更为复杂，但这个简单的例子说明了一个重要事实。

Real life is more complicated, of course, but this simple model illustrates an important truth.

youdao

真实的生活当然更为复杂，但这个简单的例子说明了一个重要事实。

Real life is more complicated, of course, but this simple model illustrates an important truth.

youdao