"something that happens once in blue moon almost never happens"
双语例句
In spite of all we have learned from space flights, the moon is still a riddle from the distant past-and will be for a long time to come. 尽管我们已经从空间飞行中了解了一些，月球仍然是来自遥远过去的一个谜，而且仍将会在未来很长一段时间如此。
There were long stretches where the vast stretches of unoccupied blue seats in Gund Arena reminded observers of an empty swimming pool. 有很长一段时间在广阔的蓝色席位冈德体育馆稀稀疏疏坐着一些人。
