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.
后焦面上的频率分布还原成像面上的光场复振幅空间分布。
The space frequency distribution on rear focal plane restores to the distribution of complex amplitude on image plane.
2是乙烯类单体经乳液聚合，并加入助剂复配而成，用于喷涂消光。
DM-2, an ethylene component co - compounded by polymerization of emulsion and the addition of auxiliaries, is employed in matting sprays.
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