Learn and live.

活着，为了学习。

Learning makes a good man better and ill man worse.

好人越学越好，坏人越学越坏。

Learn not and know not.

不学无术。

Learn to walk before you run.

先学走，再学跑。

Let bygones be bygones.

过去的就让它过去吧。

Let sleeping dogs lie.

别惹麻烦。

Let the cat out of the bag.

泄漏天机。

Lies can never changes fact.

谎言终究是谎言。

Lies have short legs.

谎言站不长。

Life is but a span.

人生苦短。