one eyewitness is better than ten hearsays.百闻不如一见。

one good turn deserves another.行善积德。

one manlsquo;s fault is other manlsquo;s lesson.前车之鉴。

one swallow does not make a summ一燕不成夏。

out of debt,out of danger.无债一身轻。

out of sight,out of mind.眼不见，心为静。