一盏灯每晚七点钟亮。
当他觉得天快亮的时候，他听到钟敲了十下！
When it seemed to him that it must be nearly daylight, he heard the clock strike ten!
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.
应用推荐