cleanMORAL kli:n adj -er, -est morally acceptable 纯洁的 It's all good clean fun. 这完全是很好的、纯洁的乐趣。 You look very healthy -- it must be all that clean living. 你看上去很健康----一定是因为纯洁的生活。 I only want to hear your joke if it's clean (=not about sex). 你的笑话不下流我才要听。