n.壁龛( niche的名词复数 )；合适的位置[工作等]；（产品的）商机；生态位（一个生物所占据的生境的最小单位） 英英释义： nichen.a position particularly well suited to the person who occupies it"he found his niche in the academic world"a small concavity同义词：recessrecessioncorneran enclosure that is set back or i