底分层 bottom slice
奥辐德顶底分层炼镍法 orford process
船底分隔 bottom separation
海底分路复用器 undersea branching multiplexer
白化病眼底分析征 Albinotic Fundus Syndrome
楦底分踵线 [服装] center line of last bottom
平生粗识安危分，脚底风波未足惊 "Having experienced my fair share of perils in life; lesser troubles are nothing alarming".
彻底分开 make a thorough break
井底分离器 bottom hole separator
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