bottomryn.船舶抵押契约;冒险贷借
bottomn.底部;底端adj.底部的v.触底;打(基础)
bottom land forest河谷林
bottom discharging底部放矿
bottom of trousers裤脚
bottom intake rack底孔进水口拦污栅
bottom otter trawl底层单拖网
bottom bracket cup中轴碗
bottom line ethics底线伦理
bottom defoliation茎秆脱叶
bottom road bridge下承式公路桥
bottom application底敷用