九代，拼音jiǔ dài，是指九个朝代。出自《请立浑天仪表》。
我希望你能用咒语诅咒他们的子孙九代。
I want you to curse them and their descendants down to the ninth generation.
第九代操作系统新增了一个全新的应用——苹果新闻。
Apple is getting a brand new app with iOS 9, and that's Apple News.
第九代操作系统还有一个新的“低电量模式”，能够帮助你将电池电量发挥到极致。
There's a new Low Power Mode that will help you get the most out of your battery life.
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