本期内容：

Pfizer, the drug company behind Viagra, and Allergan, which makes Botox, agreed on Monday to combine in a $160 billion deal, the biggest yet in the pharmaceuticals industry. Although both companies conduct most of their business in America, the complex merger will enable Pfizer to move its tax base to Ireland—where Allergan has its headquarters—and cut its American tax bill.

词义解析:

viagra: 伟哥

botox：肉毒素

pharmaceutical：制药的

merger：并购