bicrystal

例句：

1. 1.The icicles on the roof are a beautiful sight in winter.
   冬天屋顶上的冰柱是一道美丽的风景。
2. 2.The crystal clear water is so refreshing.
   清澈见底的水是如此的令人心旷神怡。
3. 3.The icicles are made from natural minerals and have been formed over millions of years.
   这些冰柱是由自然矿物质形成的，已经形成了数百万年。