去除下颌骨外板矫治面下部的宽大或不对称以及做为自体植骨骨源的方法在颅颌面外科的应用越来越多，并得到国内外学者的广泛认同。
Osteotomy of mandibular outer cortex was used to treat width and dissymmetry of lower face or as source of autogenous bone graft simultaneously in craniomaxillofacial surgery.
因此保护好坡下部的植被可以有效地防止坡面水土流失。
So, vegetation in the lower slope is very important to soil and water conservation on slopping land.
分析了鼓风炉加料装置的工况条件及存在的问题，对加料装置的下部漏斗及结合面等进行改造，延长了其使用寿命。
After analysis of operating conditions and problems in the feeder of imperial smelting furnace, the lower hopper and faying face of the feeder has been modified, thus extending its service life.
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