"The past is always tense, the future perfect."

The way positive reinforcement is carried out is more important than the amount.

The quest for understanding is the noblest pursuit of the human spirit.

追求幸福并不自私——它对于有意义的生活至关重要。

水果产业要发展，必须从种植源头抓起，品质是生命线。

所有模型都是错误的，但有些是有用的。