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本期内容：
WhatsApp scrapped its subscription fee. The messaging app, bought by Facebook for $22 billion in 2014, has until now cost 99 cents a year (after a free first 12 months). Jan Koum, the founder, said WhatsApp would seek to make money by allowing businesses to communicate with its users—but insisted it would not take third-party advertising or permit spam.
词义解析:
Scrap：取消
Subscription fee：订阅费用
Spam：垃圾邮件
