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drop keel：滑动龙骨;下垂龙骨

drop into 开进 | drop keel 滑动龙骨;下垂龙骨 | drop keel 中插板

drop keel：滑动龙骨

落锤 drop hammer | 滑动龙骨 drop keel | 落冲 drop stamp

drop letter：[美国习惯用语]托人由一地带到另一地付邮的信件

drop leaf (桌子的)活动翻板. | drop letter [美国习惯用语]托人由一地带到另一地付邮的信件. | drop like a hot potato 急忙抛弃. 尽快地断绝关系.

drop a letter：漏掉一个字母

drop one's voice suddenly突然放低了声音 | drop a letter漏掉一个字母 | drop drinking戒酒

drop line：下伸线(小楷字母)

"落锻","drop forging" | "下伸线(小楷字母)","drop line" | "点圆规","drop pen"

drop line：停止联机

偶入,冒码 drop in | 停止联机 drop line | 讯息滴失 drop on the floor

drop line：停止連線

偶入,冒碼 drop in | 停止連線 drop line | 訊息滴失 drop on the floor

drop line valve：下舱阀

drop keel 中插板 | drop line valve 下舱阀 | drop lip hook 安全钩

drop a line：写信给某人

drop a courtesy 行屈膝礼 | drop a line 写信给某人 | drop a pinch of salt on the tail of 诱惑

drop out line：放空线

drop multishot inclination survey 投入式多点测斜 | drop out line 放空线 | drop out point 滴点;析出点

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