人们普遍认为，苹果手表等智能手表的成功与否取决于能否解决电池这个问题——因为几乎没有人愿意每天为手表充电。
The success of smart watches, including Apple's version, is thought to hinge on solving this problem - because few users are willing to charge a watch every day.
库克说苹果手表将拥有18小时的电池寿命，解决了这个装置究竟要多么频繁地充电的疑问。
Cook said the Apple Watch will boast 18 hours of battery life, addressing speculation about how frequently the device would require charging.
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