The existence of a legal system is a matter of social fact.
我不相信完美。我认为那是一个非常危险的想法。那是一个非常难以实现的想法。
A mathematical proof is a poem written in the language of logic.
Brand upgrading is the only way for independent brands.
孩子需要先感受到被理解,才能改变他们的行为。