失去一个父母可以看成是一种不幸；失去双亲看上去就像是一种粗心了。
To lose one parent may be regarded as a misfortune; to lose both looks like carelessness.
教师必须为形成较好人类而献出一切。
"I don't believe in luck. I believe in hard work."
下一次绿色革命必须既高效又对环境负责。