In addition the structure of magnetic flux tube is provided also by simultaneous observation of quite a few lines.
除此之外，还可利用多条谱线的同时观测，获得有关磁力线管结构等方面的资料。
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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