Three of the four component types-activities, services, and broadcast receivers-are activated by an asynchronous message called an intent.
上述四种组件类型中，activities、services和broadcast receivers这三种是被一个叫做intent的异步消息激活的。
Three of the four component types-activities, services, and broadcast receivers-are activated by an asynchronous message called an intent.
上述四种组件类型中，activities、services和broadcast receivers这三种是被一个叫做intent的异步消息激活的。
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