day night vertical migration
day night vertical migration
昼夜垂直迁移
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
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