论文润色，修改服务

Don’t count the days, make the days count.
不要数日子，让日子有意义。

Treasure today's day, as tomorrow is not promised.
珍惜今天，因为明天不保证。

Don't let what you cannot do interfere with what you can do.
不要让你做不到的事妨碍了你能做到的事。