States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.
如果你不为产品的第一个版本感到尴尬,那说明你发布得太晚了。
美国能源独立并不意味着孤立 - 我们仍然是全球市场的一部分。
Success requires persistence, the ability to not give up in the face of failure, and to learn from that failure.
食物的未来取决于我们今天如何对待土壤。