The invention of the visible light microscope late in the 16th century introduced a previously unknown realm of single-celled plants and animals.
16世纪后期，可视光学显微镜的发明使人类第一次观察到了单细胞动植物的世界。
Smaller cells are easily visible under a light microscope.
小点的细胞在光学显微镜下容易看到。
The power of a light microscope is limited by the wavelength of visible light, which is about 500 nm.
光学显微镜的放大倍数受限于可见光的波长，大约500纳米。
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