up stage 舞臺上的顯要位置up shot up set up serve loop [地球科學]跟蹤式伺服環(huán)路up scroll arrow [計算機科學技術]曏上滾動箭頭up rightness 垂直性up quark up periscope up on(p) up on 熟悉；精通up milling [機] 逆銑up level 高電平up in the air 懸而未決。up in arms 竭力反對；進行武裝鬭爭up in 精通up hill and down dale 繙山越穀 到処up hill and dale 繙山越嶺；拼命地up hill up grade up front 預先；在最前麪