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。
我不害怕在歌曲中展现脆弱。
If you believe that every life has equal value, it's revolting to learn that some lives are seen as worth saving and others are not. We said to ourselves: "This can't be true. But if it is true, it deserves to be the priority of our giving."
The rise of China poses a significant challenge to the liberal democratic order.
企业的核心竞争力在于创新，没有创新就没有未来。