大学英语：crystal n. 水晶;晶粒

Mother gave her a necklace of crystals as a birthday present.〔妈妈给她一条水晶珠项链作为生日礼物。〕

The old woman looked into the crystal ball for a while before telling my fortune.〔老妇人朝水晶球里看了一会，然后给我算命。〕

I've made my point crystal clear that I would never agree to such a proposal.〔我已经表明了我的观点，绝不同意这个提议。〕

10. popular adj. 流行的，大众的;普及的;受欢迎的

Popular music is well liked by young people.〔流行音乐深受年轻人的喜爱。〕

Swimming is a sport popular with people of all ages.〔游泳是老老少少都喜欢的体育运动。〕

He has always been popular with / among boys in his community.〔他一直广受他那个社区的男孩子们的喜欢。〕

This restaurant offers meals at popular prices.〔这家饭店供应价格大众化的饭菜。〕

He is a good politician but he is not very popular among the people.〔他很会搞政治，但是不得民心。