19、Acids are chemical compounds that, in water solution, have a sharp taste, a corrosive action on metals, and the ability to turn certain blue vegetable dyes red.
酸是一种化合物,它在溶于水时具有强烈的气味和对金属的腐蚀性,并且能够使某些蓝色植物染料变红。
20、Billie Holiday’s reputation as a great jazz-blues singer rests on her ability to give emotional depth to her songs.