重联

重联	chóng lián	(physics) magnetic reconnection / (railways) double heading (using two locomotives at the front of a train)
重	chóng	to repeat / repetition / again / re- / classifier: layer
重	zhòng	heavy / serious / to attach importance to
联	lián	(bound form) to ally oneself with; to unite; to combine; to join / (bound form) (poetry) antithetical couplet