那个玻璃容器里盛放的是热的水银蒸汽。
灯管中充上水银蒸汽的荧光灯比它的功效高大约四倍。
Fluorescent lights, which consist of tubes filled with mercury vapour, are roughly four times more efficient.
只要极微量的水银散发到空气中就会产生不健康的水银蒸汽。
It takes very little mercury in air to create unhealthy levels of vapor.
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