释义
n. 彩虹
例句
1. A rainbow is usually seen after a heavy rain. 大雨之后常有彩虹。 2. Round about, piles of lime- stone glistened in all the colours of the rainbow. 周围一堆堆的石灰石，在彩虹一样的斑斓色彩中闪闪发光。