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1·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。

2·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。