B (不一定) 不一定 bu4 yi2ding4
not sure
unbestimmt, nicht sicher, nicht notwendig

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

不 不 no, not / un- / negative prefix
一 一 one / a, an / alone
定 定 decide, settle, fix

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

不一定' + 不一定* * + not necessarily/ maybe