Happening once in two years.

每二年一次的。

Continuing or existing for two years.

持续二年的；二年生的。

A plant which produces roots and leaves in the first year, and flowers, fruit, and seed in the second, and then dies.

【植】二年生植物(第一年生根生叶，第二年开花结实，后即凋萎)。

An event which is held once in two years.

两年发生一次的事。