bottom on建立在
bottomn.底部;底端adj.底部的v.触底;打(基础)
bottom discharge opening底部卸料孔
bottom sediment of fiver河流底泥
bottom layer burial flux底层通量
bottom articulated joint底部铰接缝
bottom hole inclinometer井底测斜仪
bottom two-layer frame底部两层框架
Bottom- initiated Bomb孔底起爆弹
bottom tribulation novel底层苦难小说
bottom die of box-beam箱梁底模
bottom pipe distribution下分式管分配