a leopard cannot change its spots.

积习难改。

a liar is not believed when he speaks the truth.

说谎者即使讲真话也没人相信。

a light heart lives long.

静以修身。

a little body often harbors a great soul.

浓缩的都是精品。

a little knowledge is a dangerous thing.

一知半解，自欺欺人。

a little pot is soon hot.

狗肚子盛不得四两油。

all are brave when the enemy flies.

敌人逃窜时，人人都成了勇士。

all good things come to an end.

天下没有不散的筵席。

all rivers run into sea.

海纳百川。

a bosom friend afar brings a distant land near.

海内存知己, 天涯若比邻。

most men's friendships are too inarticulate.

人的友谊是无法言喻的。

friendship is like a plant of slow growth.

友谊像生长着的植物, 是慢慢地建立起来的。

a good book is the best of friends, the same today and forever.

好书如挚友, 情谊永不渝。

a man knows his companion in a long journey and a little inn.

路遥知马力, 日久见人心。