解释：凡要谋划一件事，一定要预见到成功的把握，然后才可以去做。

化学是一门研究物质性质及其变化的科学。

I think the best role models for women are people who are fruitfully and confidently themselves, who bring light into the world.

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。