数算练习告诉我们算术运算的原理，而不是单单的记忆和不断演算。

Quality is not a chance; it is a choice.

DNA的结构不仅仅是一个发现；它是生物学上的一场革命。

New energy is not only the direction of industrial upgrading but also an important part of national strategy.

我们都只是曾经存在的某种东西的回声。

I think the best relationships are the ones where you can be completely yourself.

安全不是优先事项，而是一种价值观。你无法优先考虑永远不应妥协的事情。