| 单词 | biennial |
| 释义 | biennial [baɪ'en.i.əl] adjective ■happening once every two years 两年一次的 Compare annual ; biannual [baɪ'en.i.əl] noun countable ■a plant that lives for two years, producing seeds and flowers in its second year 两年生植物（第二年开花） Compare annual ; biannual ; perennial |
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