直到最近，美国海军在太平洋或印度洋仍无对手。
Until recently, no naval force in the Pacific or Indian Ocean could challenge the US Navy.
消费者只要认购了打折后的捆绑式服务，就不会去选择竞争对手的任何单一的无折扣服务。
Customers who sign up for a bundle of services and its associated discount cannot defect to a rival provider of any one of the services without losing the discount.
即使是在新的金读上，你也无法阅读以 ePub 格式保存的无版权保护的书籍，而在其竞争对手的产品中却可以使用。
Even on the new Kindle, you can’t read nonprotected books in the popular ePub format, as you can on its rivals.
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