Our goal is to let consumers buy the best products at the lowest prices.
The truth is, I am not a very good person. But I am trying to be better.
如果我们想要清洁的空气和水,就必须从保护森林开始。
科学方法是统一且不可分割的,科学方法既适用于物理问题,也适用于社会问题。