We serve the motherland, also cannot use the same way, everyone should according to the information, from each according to his ability.
我们为祖国服务,也不能都采用同一方式,每个人应该按照资禀,各尽所能。
一门科学的历史就是它的问题域的历史。
The best time to plant a tree was twenty years ago. The second best time is now.