of an approach to a problem that begins with details and works up to the highest conceptual level
bottom-up详细解释
bot.tom-up adj.(形容词)Progressing from small or subordinate units to a larger or more important unit, as in an organization.从细节到总体的,从个别到全貌的,自下而上的:逐步从小的或下级的单位向较大或较重要单位前进,如在组织中