石蕊: 从几种地衣类植物中获取的带色有机化合物的混合物.Litmus: Mixture of coloured organic compounds obtained from several species of lichens.地衣类植物生长速度慢,有好几年的寿命.其生长依赖于霉菌和海藻的共生.Lichens, which grow slowly and live for many years, result from fungi a...
As a sportsman, he is long past his sell-by date.作为一名运动员，他早已风光不再。The newspaper publishes a profile of a leading sportsman every week.该报每周刊登一篇关于一名优秀运动员的简介.His brother is a sportsman of our school.他弟弟是我校的运动员....