1865年的一个晴朗的早晨,阳光从窗口照射到病床上,英国医学家利斯特忽然发现照射进来的一束束阳光中有无数的灰尘在飞舞,可是光束的周围却仿佛什么也没有。利斯特灵机一动,开始设想:空气中随时都有无数的灰尘在飞舞,但没能引起人们的注意,那些微小的细菌可能就躲藏在飞飞扬扬的灰尘上。空气流动 On a clear morning in 1865, when the sun shined through the window onto the sickbed, British medical scientist Lizzie suddenly discovered that there was innumerable dust in the beam of sunlight that had come in, but there was nothing around the beam. When Leicester reacted, he began to imagine that in the air, countless dusts were flying at any time, but they did not get people’s attention. The tiny bacteria may be hiding in the dust that is soaring. air flow