triennial
/traɪˈeniəl/adjective [原级] 每三年的；连续三年的
We signed a triennial contract yesterday. 昨日我们签了一项三年的合约。
noun [专属名词] 三年生植物
According to the agreement, the bank provided 30 billion annually triennial comprehensive credit lines. 根据协议，农行提供三年期每年30亿元的综合授信额度。
