今天我们要学的词是dual。Dual 双重的。A number of Taiwan residents who hold dual citizenships have chosen to renounce their American citizenship to avoid paying taxes under the Foreign Account Tax Compliance Act. 一些拥有双重国籍的台湾人决定放弃美国国籍，以免交按照海外帐户税收法案必须缴纳的税款。In a new book, two doctors claim that the rising cost of medical care in the U.S. is a dual threat to our health and pocketbooks. 两个医生在发表的新书中说，美国不断上涨的医疗开销是对民众健康和钱袋的双重威胁。好的，今天我们学习的词是 dual, dual, dual...