upper arm上臂,上腕upperadj.较高的；上面的；上部的n.鞋帮；上铺n.兴奋剂；令人兴奋的经历Upper hydraulic cushion机械制造Upper cervical vertebra上颈椎Upper - labial frenum上唇系带upper temperature limit温度上限uppermost in one's mindupper airway resistance上气道阻力upper-air observation高空观测upper-level threshold上阈upper approximation set上近似集upper crustal structuren.上地壳构造