例句與造句

1. This makes space telescope invaluable for identifying a rare class of pulsating stars , called cepheid variable stars embedded within m100 ' s spiral arms
   這對(duì)于從m100的旋臂中分辨出暗藏的造父變星有著莫大價(jià)值。
2. Astronomers made observations of cepheid variable stars [ pictured above ] ? pulsating stars used to measure vast distances ? in the virgo and other clusters to establish the expansion rate and the universe ' s age
   天文學(xué)家用哈勃觀測(cè)到仙女星座和其它星群中的造父變星(如圖) ，以確定宇宙的膨脹速度和宇宙的年齡。
3. It's difficult to find pulsating star in a sentence. 用pulsating star造句挺難的