doub meaning in English

成双的；两倍
道布

General specification for maintenance shelter of doub 35 fire control system
双35火控系统维修方舱通用规范
6 . relationship between the double sh ridges and the rainbands in the east china in summer a station data - based investigation is undertaken , discovering the close relationship between the double - ridge maintenance upon the rainfall pattern of eastern china , also indicating that the single - related vapor passage is changed during the doub
( 6 )副高双脊线对夏季中国东部雨型的影响通过对中国台站降水资料的分析，发现副高双脊线的维持与中国东部雨型有密切的关系。