bottom on建立在
bottomn.底部;底端adj.底部的v.触底;打(基础)
bottom-living predator底栖捕食者
bottom-water reservoir底水油藏
bottomless cup of coffee尽添不收费
bottom hinged ventilator下折翼气窗
bottom-oil temperature底部油温
bottom of the excavation槽坑底
bottom water temperature底层水温
bottom third wheel jewel秒针轮下钻
bottom cooling waterpipe炉底水管
bottom half inner casing内下汽缸