解释：自己行为不端的人就难以要求别人行为端正，不孝顺父母的人也不能忠于君主。

Patience is key in observational astronomy—some discoveries take decades to confirm.

Science is not just about discovery, but also about the application of knowledge to improve human life.

Happiness is not something you postpone for the future; it is something you design for the present.

Be yourself and you can be anything.

Every exit is an entry somewhere else.

The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence.

不过话得说回来，没有一桩事是容易的。