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toroidal core
el.	环形铁芯
oil	环形磁心
tech.	圆环柱心; 环形磁芯; 环形铁〔磁〕芯; 圆环柱芯
telecom.	环形铁心

toroidal -core : 4 phrases in 3 subjects

Electronics	2
Power electronics	1
Technology	1