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steam drop hammer：蒸汽落锤

power drop hammer 蒸汽锤. 动力落锤. | steam drop hammer 蒸汽落锤. | take a drop of something 喝一点酒.

drop hammer test：落锤试验

drop hammar 打桩落锤 | drop hammer test 落锤试验 | drop pit 溜道

drop hammer test：落鎚试验,落重试验

"drop hammer driver","落鎚打椿机" | "drop hammer test","落鎚试验,落重试验" | "drop hanger","吊架"

drop in：顺便访问

14.drop by 顺便访问 | 15.drop in 顺便访问 | 16.drop off 减弱

drop in pressure：压力降低

drop hammer落锤 | drop in pressure压力降低 | drop lubrication滴油润滑

drop in beam：挂梁

drop heating system 下给式供热系统 | drop in beam 挂梁 | drop penetratoin test 动力触探试验

drop in on：顺道拜访

drop down 卧倒 | drop in on 顺道拜访 | drop in 顺便走访

drop in on：拜访(后接人)

drop in at 拜访(后接地点) | drop in on 拜访(后接人) | drop across 串门,偶遇

drop in on：順便訪問(人)

22. drop in at 順便訪問(地方) | 23. drop in on 順便訪問(人) | 24. drop out of 退出(活動)、輟(學)

drop keel：中插板

drop keel 滑动龙骨;下垂龙骨 | drop keel 中插板 | drop line valve 下舱阀

Going to Pubs：上酒吧小酌

Part V 夜生活篇 Nightlife | Unit 21 上酒吧小酌 Going to Pubs | Unit 22 看表演 Seeing Shows

simplified equation：简化方程式

secondary alcohol 仲醇 | simplified equation 简化方程式 | tertiary alcohol 叔醇