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double combustion boiler：双炉镗锅炉

double-claw flexible coupling 双爪式挠性联轴器 | double-combustion boiler 双炉镗锅炉 | double-compound engine 双联双胀式蒸汽机

double-acting cylinder：双酌汽缸

double acting compressor 双动压缩机 | double acting cylinder 双酌汽缸 | double acting engine 双酌发动机

Double-ended spanner：双手扳手

Double door 双开门 | Double ended spanner 双手扳手 | Double-engine drive 双发动机驱动

Downsizing engine：小型化发动机

Frontal styling 前沿风格 | Downsizing engine 小型化发动机 | Northampton 北安普敦

dozen：一"打", 十二个

disk "碟" | dozen 一"打", 十二个 | engine"引擎"、发动机

tilting dozer：倾卸式推土机

tilting concrete mixer 翻转式混合机 | tilting dozer 倾卸式推土机 | tilting engine 可倾斜的发动机

Drain off the excess fat from the meat：把肉里面多余的油沥掉

We had to drain the oil out of the engine. 我們必須把發動機裏的機油... | Drain off the excess fat from the meat. 把肉裏面多餘的油瀝掉. | She pulled out the plug and the water drained away. 她拔掉塞子,...

tank drama：暴力剧

tank destroyer 反坦克装甲车 | tank drama 暴力剧 | tank engine 蒸气火车头

main driving wheel：主[驱]动轮

主[驱]动轴 main driving axle | 主[驱]动轮 main driving wheel | 主机 main engine

drop worm shaft：落蜗杆轴

drop vlave engine 带配汽阀蒸汽机 | drop worm shaft 落蜗杆轴 | drop worm 落蜗杆

steam trap valve：疏水阀

球阀 ball valve | 疏水阀 steam trap valve | 蛇管式换热器 serpentine type heat exchanger

aldermanship：市政官

aldermanry 议员 | aldermanship 市政官 | Alderney 乳牛