短时间内频繁开关节能灯会降低它的使用寿命：固定安装或安装在房间的节能灯每次至少应亮15分钟后再关闭。
Repeatedly turning CFLs on and off shortens their lifespan: Install CFLs in fixtures or rooms you keep lit for more than 15 minutes at a time.
当我看到街的尽头有两个耀眼的车灯时（就在很短的时间之前，我还没有看到有灯在亮），我又一次害怕了。
When I saw two glaring car headlights at the top of her street (which I had not noticed a very short time earlier) I once again started to freak out.
我发现，通常安全带灯亮后到真正扣上安全带之间，还有15分钟的活动时间。
Usually when the seatbelt light comes on, I've found that you still have 15 minutes of leeway until you truly have to be seated.
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