The best time to plant a tree was 20 years ago; the second-best time is now.
种一棵树最好的时间是20年前,其次是现在。
The challenge of creating efficient and selective catalysts keeps me motivated every day.
孩子们能看到成年人忽略的细节——这就是绘本如此重要的原因。
The pain of discipline is better than the pain of regret.