定期切换回到乐观的方法，看看有没有发生变化。
Periodically switch back to the optimistic view to see if things have changed.
越南担心大大减少增值税电动牙刷将是他们的缺点，并可能鼓励许多人定期切换到电动牙刷。
The Vietnamese worry that the considerable reduction in VAT on electric toothbrushes will be to their disadvantage, and may encourage many people to switch from regular to electric toothbrushes.
这就意味着手机需要定期切换到“活跃”状态，接收需要的数据，然后进入“空闲”状态，随着时间的推移，这些细微的操作总共将消耗大量的电池和网络流量。
So that means the phone has to regularly go active, get the data it needs, then go idle again, and over time all those little transitions add up to a lot of battery life and network traffic.
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