通知应给予用户那些有用的，可付诸操作的信息，即使他们没有使用你的应用程序。
A notification should give users useful, actionable information they want to receive, even when they're not using your application.
其次，买方应给予卖方合理的拒绝接受通知；
Secondly, the buyer should give the seller seasonable notification of rejection;
其次，买方应给予卖方合理的拒绝接受通知；
Secondly, the buyer should give the seller seasonable notification of rejection;
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