例句與用法

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1. major meteor stream
   主要流星群
2. most of the meteoroids of the leonid meteor stream concentrate in an elongated thin ribbon-like region . the stream orbits around the sun in an elliptical orbit with a period of about 33 years
   獅子座流星群聚集于一條狹長的區(qū)域內(nèi)，以極為橢圓形的軌道環(huán)繞太陽運行，周期約為
3. the duration of twilight, details of equinoxes, solstices, eclipses, information on calendar, observation of meteor streams and planetary phenomena as well as climatological " normals " of hong kong and some major cities for each month of the year are also given in this publication
   此外，年歷內(nèi)亦列出曙暮光的持續(xù)時間，以及春分、秋分、夏至、冬至、日食、月食、歷法、流星群及行星觀測等詳盡資料。
4. the numerical computation for the secular variable of the semi-major axis, solar distance at perihelion, orbital periods and longitude of perihelion has been made for fifteen meteor streams by using the solution of gylden-meshcherckii equations
   利用g-m型變質(zhì)量天體軌道根數(shù)變化方程的一階和二階解對15個流星群軌道半長軸、近日點距離、軌道周期和近日點經(jīng)度因太陽質(zhì)量損失造成的每世紀(jì)的長期改變效應(yīng)做了數(shù)值計算，并得出計算結(jié)果。