In 1920, the comparison eyepiece is introduced, which allows simultaneous observation of two specimens under two microscopes.
1920年，比较目镜问世。此项技术使得可以同时观察到来自两台显微镜的样品。
In 1920, the comparison eyepiece is introduced, which allows simultaneous observation of two specimens under two microscopes.
1920年，比较目镜问世。此项技术使得可以同时观察到来自两台显微镜的样品。
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