热热热久久久免费视频|第四色五月婷婷五月天AV|日韩高清无码免费一级大片|日本成人手机在线视频|中文字幕无码Av在线|台湾a级别黄片免费看|欧美一级性爱亚洲第一性爱|A级黄色电影久草大|www.91精品视频|亚洲AV资源欧洲无码在线观

單詞乎

sextant

音標['sekstənt]
sextant是什么意思、sextant怎么讀

sextant漢語翻譯

n. 六分儀

sextant英語解釋

名詞 sextant:

  1. a unit of angular distance equal to 60 degrees
  2. a measuring instrument for measuring the angular distance between celestial objects; resembles an octant

sextant例句

  1. A medieval instrument, now replaced by the sextant, that was once used to determine the altitude of the sun or other celestial bodies.
    星盤一種中世紀的儀器，曾用來測量太陽或其它天體的高度，現(xiàn)在已被六分儀取代
0
糾錯