| 词汇 | biennial |
| 释义 | adjectivenounbi·en·nialBrE /baɪˈeniəl/ NAmE /baɪˈeniəl/ adjective [usually before noun ]happening once every two years 两年一次的◆ a biennial convention 两年召开一次的大会▸ bi·en·ni·al·ly BrE /baɪˈeniəli/ NAmE /baɪˈeniəli/ adverb ➡ see also annualadjective , biannualbi·en·nialBrE /baɪˈeniəl/ NAmE /baɪˈeniəl/ noun any plant that lives for two years , producing flowers in the second year 两年生植物（第二年开花） ➡ compare annualnoun , perennialnoun |
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