君子做学问，目的是为了明白道理，拯救社会。

In the midst of winter, I found there was, within me, an invincible summer.

密码学的艺术是使破解系统的成本超过受保护信息的价值。

The only valid data for psychology are observable behaviors.

Climate change isn't a future threat to forests—it's the chainsaw at work right now.