The key to survival is preparation. Know your environment and be ready for anything.

儿童书籍应该挑战、安慰和激励。

Happiness is rarely absent; it is we that know not of its presence.

解释：辛辣食物走气分，气虚或气病的人不宜多食，体现了饮食与病症的关联。

人们可以非常聪明或拥有直接适用的技能，但如果他们不真正相信它，那么他们就不会真正努力工作。