音标：['kelsn, ki:lsn] ；

n. 内龙骨

n. a longitudinal beam connected to the keel of ship to strengthen it

词型变化：名词复数形式 : keelsons

keelson的用法和样例：

词汇搭配

middle line keelson中内龙骨
side keelson旁内龙骨
engine keelson承受发动机的内龙骨...

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发表于:2018-11-29 / 阅读(312) / 评论(0)

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calibrated focal length