The success of wind power represents a litmus test for renewable energy.风能作为动力的成功是对可再生能源一次立见分晓的检验。unsized paper treated with litmus未定尺寸经石蕊处理的纸Litmus paper can be used as an indicator of the presence of acid in a solution...
她在世界各地跳过舞、编过舞、讲过学、也教过书。She has danced, choreographed, lectured and taught all over the world.他是个经验丰富的跳伞者，已经跳过150多次伞了。He was an experienced parachutist who had done over 150 jumps.警察在追捕中跳过西班牙大使馆的围墙。Policemen jumped over t...