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to phrases
annular ring
archit. 环圆圈
compr. 环圈
nautic. 年轮; 环孔
space 孔环 (印制电路板的)
tech. 木材年轮; 树木年轮
annular ring
: 10 phrases in 4 subjects
Compressors1
Electronics2
Space3
Technology4

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