日本三级无码啪啪区|午夜视频久久一区久久一|AAAAA一级黄片|日本久久99久久|国际精品AV在线|狠狠2015亚洲一区|美腿丝袜亚洲网站|欧美色多多人人看|国产超碰美女在线|www色色在线色

單詞乎

plumb-line

plumb-line是什么意思、plumb-line怎么讀

plumb-line漢語翻譯

vt. 用鉛錘線測量, 檢查, 探測

plumb-line英語解釋

名詞 plumb-line:

  1. a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point
    同義詞：plumb line, perpendicular
0
糾錯(cuò)