荧光灯用电激发水银蒸气。这会生成紫外线光而使得镀在灯管内壁上的磷涂层发光.
Fluorescent lights use electricity to excite mercury vapor. This produces ultraviolet light that causes a phosphor coating inside the bulb to glow.
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这种方式非常有效，但是汞(即水银)蒸气却含有剧毒。
It is effective, but mercury vapour is extremely toxic.
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