Every chemical compound must have a definite composition, which can be expressed by the symbols of its elements.
每一种化合物都必须有确定的组成,这可以用其元素的符号来表示。
我们都对我们所创造的世界负有责任,因此我们必须共同努力去改变它。
The biggest risk is not taking any risk. In a world that's changing quickly, the only strategy that is guaranteed to fail is not taking risks.
我们管理的最宝贵资源不是木材,而是信任。