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Ji Ke CAI
以上为机器翻译结果，长、整句建议使用 人工翻译 。
有趣的是我们注意到，虽然培根在13世纪末期就使用放大镜了，但直到17世纪才由列文虎克将放大镜对准一滴水。
It is interesting to note that magnifying lenses were used by Bacon in the late 1200s, but had never been focused on a drop of water until the 1600s by Leeuwenhoek.
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