政府的职责是帮助那些无法自助的人。

Investors should focus on asset allocation rather than market timing.

When I see someone wasting a glass of water, I think of those who don't have water on Earth.

化学是一门一直贴近我内心的科学，我以喜悦和热情将一生奉献给了它。

成人必须给幼儿提供活动的空间。