在海拔2250的高空，空气十分的稀薄；白天，人们熟知的棕色“毒气”沉降到城市里，令人窒息。
At its altitude of 2, 250m the air is already thin; on days when the toxic "cream", as the familiar brown cloud of pollution is locally known, descends on the city, it is hard to breathe.
用普通营养琼脂平板和兔血营养琼脂平板对医院环境空气进行沉降采样检测，并对结果进行比较分析。
Methods general nutrition AGAR plate and rabbit blood nutrient AGAR plate of the hospital environment for the settlement of air sampling tests and the results were compared.
用平板沉降法和GLJ - BG型尘埃粒子计数仪分别测定了空气中的细菌总数、埃粒子数。
Total bacterial count of air and dust particle count were measured by plate sedimentation method and GLJ-BG-type dust particle counter.
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