3.当我看到浪费一杯水的人时，我就会想到地球上那些连水都喝不上的人。
When I see someone wasting a glass of water, I think of those who don't have water on Earth.
The more we love our friends， the less we flatter them； it is by excusing nothing that pure love shows itself.
The past is a shadow that follows us, a ghost that haunts us.
Precision in experimentation is as important as creativity in hypothesis.