D (繁重) 繁重 fan2zhong4
heavy/ onerous
schwer, schwierig

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Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

繁 繁 complicated, complex, difficult
重 重 heavy, weighty / double

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from CC-CEDICT under a Creative Commons Attribution-Share Alike 3.0 License

繁重' + 繁重* * + heavy/ burdensome heavy-duty