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DC electric propulsion
 DC electric propulsion
shipb. 直流电力推进
| ship
 ship
environ. 运输
hydroel.st. ; 船舶
interntl.trade. 用船运; 装货; 运送
navig.
space ;

to phrases
DC electric propulsion
shipb. 直流电力推进
DC electric propulsion: 2 phrases in 1 subject
Shipbuilding2