| 单词 | annual migration |
| 释义 | annual migration More than a million snow geese stop for a rest during annual migration and block out the sky. The Sun (2009) She is just hoping that most will be away on an annual migration in Hawaii and that those left behind will leave her alone. Times, Sunday Times (2010) Migratory monarch butterflies use a delicate sun compass in their annual migration. Smithsonian Mag (2017) |
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