He invented the ultramicroscope in 1903, and two types of membrane filters in 1918 and 1922.
1903
明了超显微镜，1918和1922又
别明了两种滤膜。
He invented the ultramicroscope in 1903, and two types of membrane filters in 1918 and 1922.
1903明了超显微镜，1918和1922又别明了两种滤膜。
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