D (保溫) 保温 bao3wen1
heat preservation
Wärmehaltung, Isolation

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

保 保 protect, safeguard, defend, care
溫 温 lukewarm

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保溫' + 保温* * + to keep heat preservation/ Thermos (bottle)