| 序号 | 英文 | 音标 | 词性 | 中文 |
| | bottleneck problem | | | 薄弱环节问题 |
| | bottlenose | `bCtlnEuz | n. | [动]宽吻海豚 |
| | bottlenose dolphin | | n. | 宽吻海豚 |
| | bottlenose whale | | | 巨齿槌鲸 |
| | bottler | 5bCtlE | | 灌注机, 灌瓶机 |
| | bottlery | | | 灌瓶车间 |
| | bottletree | | | 瓶木属 |
| | bottling | 5bCtliN | | 灌注 |
| | bottling cellar | | | 装瓶酒窖, 装瓶窖房 |
| | bottling chamber | | | 装瓶室 |
| | bottling department | | | 装瓶车 间, 灌装间 |
| | bottling machine | | | [核]装料设备 |
| | bottling room | | | 灌瓶室, 装瓶室 |
| | bottom | 5bRtEm | n.；adj.；vt.；vi. | n. 底, 底部, 尽头, 末端；adj. 底部的；vt. 装底, 查明真相, 测量深浅；vi. 到达底部, 建立基础 |
| | bottom angle | | | 齿根角 |
| | bottom anvil | | | 底砧 |
| | bottom arch bar | | | (拱板转向架)下拱板 |
| | bottom balance endpiece screw | | | 摆下托钻螺钉 |
| | bottom balance jewel | | | 下摆钻 |
| | bottom ballast | | | 底碴 |
| | bottom bench | | | 下台阶 |
| | bottom block | | | (盛钢桶)桶[包]底大块砖 |
| | bottom blow | | | 下吹机, 底部吹泄 |
| | bottom blow acid converter steel | | | 底吹酸性转炉钢 |
| | bottom blow basic converter steel | | | 底吹碱性转炉钢 |
| | bottom blown converter | | | 底吹转炉 |
| | bottom board | | | 斜滑板, 抖动板 |
| | bottom bolster | | | 摇枕 |
| | bottom boom | | | 底桁 |
| | bottom border | | n. | 底框 |
| | bottom bounce | | | 海底多次反射 |
| | bottom bounce sonar | | | 海底反射声纳 |
| | bottom box | | | 底箱 |
| | bottom brace | | | (轴箱)下拉条 |
| | bottom break | | | [采矿]底部断裂 |
| | bottom breaker | | | 下缓冲层 |
| | bottom brick | | | 炉底砖 |
| | bottom brush | | | 洗瓶底的刷子 |
| | bottom center wheel jewel | | | 中心轮下钻 |
| | bottom channel | | | 底沟 |
| | bottom check | | | 底部裂缝(玻璃制品缺陷) |
| | bottom chord | | | 底弦, 下弦 |
| | bottom chuck | | | 下轴承座 |
| | bottom clearance | | | 齿根与齿顶间的间隙， 径向间隙 |
| | bottom connecting rod | | | 下拉杆(制动) |
| | bottom construction | | | 炉底［底部］结构 |
| | bottom contact | | | 后接点， 落下接点， 静合接点 |
| | bottom course | | | 底层 |
| | bottom cover | | | 底盖， 后盖 |
| | bottom cross beam | | | 底横梁 |
| | bottom cut | | | 底部掏槽, 底槽 |
| | bottom cutter | | | (甘蔗收割机的)根部切割器 |
| | bottom cutting | | | 底部截槽, 掏槽底 |
| | bottom dead centre | | | 下死[止]点 |
| | bottom delivery feed | | | 下排式排种器[排肥器] |
| | bottom diameter | | | 螺纹内径, 螺纹底径 |
| | bottom die | | | 下模 |
| | bottom discharge | | | 活底卸料, 底部卸载 |
| | bottom discharge bucket | | | 底卸式吊桶, 底部卸料斗 |
| | bottom discharge meat mixer | | | 底部出料的肉馅混拌机 |
| | bottom door | | | (底开门车)底门 |
| | bottom door hanger link | | | 底门吊环 |
| | bottom door hinge | | | 底门折页 |
| | bottom door operating handle | | | 底门摇把 |
| | bottom door winding chain belt fastener | | | 底门吊 |
| | bottom door winding shaft | | | 底门卷链轴 |
| | bottom double border | | n. | 底端双边框 |
| | bottom drain valve | | | 底部放泄阀 |
| | bottom draw | | | 底部吸引 |
| | bottom drawer | | | <美>(妇女为结婚准备的)嫁衣 |
| | bottom dump | | | 活底卸料 |
| | bottom dump tipper | | | 底卸载自卸船 |
| | bottom dumping material handing box | | | 活底料斗 |
| | bottom dyeing | | | 底层染色 |
| | bottom edge | | | 地脚空白 |
| | bottom entry | | | 下端插入(印刷板) |
| | bottom facing machine | | | 转底光面机 |
| | bottom fauna | | | 海底动物区系, 底栖动物区系 |
| | bottom feeder | | | 食底泥动物, 食底泥鱼 |
| | bottom felt | | | 下毛纸 |
| | bottom fermentation | | | 底层发酵 |
| | bottom fish | | | 底栖鱼 |
| | bottom flange | | | 底缘 |
| | bottom flange plate | | | 底翼缘板, 凸缘底板 |
| | bottom flap | | | 折叠底(板), 底折翼 |
| | bottom flash | | | 底飞边 |
| | bottom flue | | | 小烟道 |
| | bottom force | | | 底冲床 |
| | bottom fork | | | 平叉 |
| | bottom formwork | | | 底模 |
| | bottom fourth jewel | | | 过轮下钻 |
| | bottom friction | | | 底摩擦力 |
| | bottom gear | | | (变速机构的)头挡, 低速排挡 |
| | bottom girder | | | [船]底桁材 |
| | bottom glade | | | 底谷 |
| | bottom guide bar | | | 下端导杆 |
| | bottom half | | | (抽签)下半区 |
| | bottom heading | | | 下导坑, 底导坑 |
| | bottom heating | | | (发动机起动时)底部预热 |
| | bottom hole | | | 底孔, 下部孔 |
| | bottom hole pump | | | 井底沉没式泵 |