| 单词 | semidiurnal |
| 释义 | semidiurnal[,semidai'ə:nl]a. 半天的, 一天两次的 semidiurnal sem.i.di.ur.nal AHD: [sµm”¶-dº-ûr“n…l, sµm”º-] D.J. [7semi8da!6T8n*l, 7sema!-]K.K. [7sWmida!6Pn*l, 7sWma!-]adj.（形容词）1. Of, relating to, occurring, or performed during half a day.半天的：半天的、与之相关的、出现于其的或完成于其的2. Occurring or coming approximately once every 12 hours, as the tides.一天两次的：近乎每12小时出现或发生一次的，如潮汐3. Of or relating to the arc described by a celestial body between its meridian passage and its points of rising or setting.半日圆拱：天体在其子午圈与升落位置之间描出的圆拱轨迹的或与之相关的 |
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