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sistema di protezione
el., sec.sys.	保護継電システム
nucl.phys.	保護系 原子炉の
wind.	保護装置 ＷＴＧＳの (hogo-sōchi)

sistema di protezione: 4 phrases in 4 subjects

Electric machinery	1
Electricity generation	1
Isolation	1
Rail transport	1