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four element
 four-element abbr.
gen. 四元 的
 | infrared objective
 infrared objective abbr.
met. 红外线物镜

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four-element

[ˌfɔːr'εlɪmənt]
gen. 四元素的
tech. 四透镜
four element
: 12 phrases in 5 subjects
Chemistry2
Electronics1
Space2
Taekwondo2
Technology5

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