1. 第五：fifthly 第五 | fifths 第五 | fiftieth 第五十
2. 五度管乐：86 0 85 Voice 人声管乐 | 87 0 86 Fifths 五度管乐 | 88 0 87 Bass lead 贝司管乐
1. fifths的解释
1. By outsourcing design jobs to local partners, global companies can trim costs by up to four fifths.
2. Three fifths of these couples have a university education, a decent job and income.
3. Four fifths of the world's population live in developing countries while only one fifth in developed countries.