The United States is the most powerful country in the world, and it will remain so for the foreseeable future.

Enterprises must fulfill their social responsibilities, promoting environmental protection and sustainable development while ensuring energy supply.

在黑暗中，我们学会珍惜光明。

一个常见的经验是，一个晚上难以解决的问题在睡眠委员会工作后，在早上得到了解决。