短語詞組短語bottom density current 底層密度流bottom m current meter 底層流速計deep bottom counter current 深底層逆流Bottom residual current 海底餘流bottom traction current 牽引底流bottom m current 海底強流near bottom current 近底層流upstream bottom current 曏源底層流bottom current meter 底層流速計;底流儀 返回 bottom current