解释：辅与车互相依存，嘴唇没有了，牙齿就要受寒。
Sustainability is not a choice, it's a necessity.
Legal positivism emphasizes the separation of law and morality.
The true value of a forest goes far beyond its timber.
Patience is the secret ingredient in every successful bake.
The only way to find out anything about what kinds of books people would like to read is to publish books and see what happens.