控制的目的是使系统在存在不确定性和干扰的情况下仍能按期望的方式运行。
The United States is the most powerful country in the world, and it will remain so for the foreseeable future.
我首先是个妈妈，其他都是其次。
The earth gives us coal; our duty is to give back stewardship.
The modern state is characterized by its ability to concentrate and use power effectively.
Man is an animal that makes bargains: no other animal does this—no dog exchanges bones with another.
人是会讨价还价的动物：没有其他动物会这样做——没有狗会与另一只狗交换骨头。
Science is about pushing boundaries, both in knowledge and technology.