an intercalary year

• 闰年

an intercalary year的用法和样例：

例句

1. A leap year occurs once every four years.
   每四年才有一次闰年。
2. Some say that coins found heads-up are also luck, and that a coin minted in a leap year will bring good fortune.
   还有人说发现正面朝上的硬币也是吉祥的，铸造于闰年的硬币也能带来好运。