所以既然官方没有宣布确定时间，就不能说苹果延迟发售。
高延迟会导致在任何给定时刻都有大量正在传送的包在等待应答。
Because of the high delay, there are often large Numbers of packets "in flight" waiting for acknowledgment at any given time.
SLA应该指定给定时间周期(假设一个月)内的平均来回延迟和数据报丢失。
The SLA should specify an average round-trip latency and packet loss over a given time period — within a month, say.
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