1、salt of the earth 形容一个人接人处事诚恳正直，是一位诚实善良的人。例句： Annie is the salt of the earth. Despite all her own troubles she is the first to offer help to do the chores for her elderly neighbour. I didn’t realize that lollipop men and women are volunteers. They really are the salt of the earth, standing out in all weathers to make sure children cross the road safely.
2、 to rub salt into someones wound 在伤口上撒盐，这个比喻常用来形容加深某人的创痛。例句： He lost his job and then to rub salt into the wound his wife left him on the same day. I don’t want to rub salt into the wound but you missed a really great party last night. Anyway, how’s the cold?