天底
tiān dǐ
- nadir
天底 天底
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[nadir] 从观测者垂直向下与天球的交点或与天顶相距 180的点
天底[tiān dǐ]
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感觉上我们好像已从天底走到了天顶
It feel as If we have traveled from nadir to zenith
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我们所爱的一切溺入天底；
That sinks with all we love below the verge ;
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这天底下哪有大半夜里搬家的呀？
Who in the world moves in the middle of the night ?
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这种临边探测技术结合了天底和掩星两种技术的优点：提供如天底模式一样高空间分辨率全球覆盖的大气痕量气体分布，且能与掩星模式相媲美的高垂直分辨率的气体廓线。
This technique , combining the advantages of other techniques , provides vertical profiles of trace gas with high vertical resolution comparable to that of occultation measurements and with significantly better global coverage as nadir observations .