Use blinds or blackout curtains to keep out light. Switch off or cover anything that emits light, such as an alarm clock.
在睡前灯光越暗越好，最好是一点灯光也没有，用一些黑色的窗帘阻挡灯光，替换所有会吸光的东西，如会发光的钟。
Flow indicator light integral with switch cover. Indicates flow or no flow conditions.
与开关盖一起配置的流量指示灯。指示有流量或无流量情况。
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