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to phrases
阶梯光栅
jiētī guāngshān
oil
echelon
space
echelle
tech.
echelon grating
中
阶梯
分级
光栅
gen.
echelle
阶梯光栅
:
11 phrases
in 4 subjects
Astronomy
1
Chemistry
2
Space
2
Technology
6
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