有些词汇和短语反反复复地出现，黑暗和光，光和黑暗。
There are phrases and words that come up over and over again, darkness and light, light and darkness.
准倾斜光纤布拉格光栅，复联光纤布拉格光栅，光纤型耦合器和光连接器。
Pseudo slant fiber Bragg grating, multiple series fiber Bragg grating, optical fiber type coupler and optical connector.
并用电解复膜原理和光蚀效应对研究结果进行了讨论。
The results were discussed from the principle of electrolytic coating film and light etching effect.
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