... moisture migration 水分迁移,水分转移 seasonal migration 季节性迁徒,季节性回游 spawning migration 产卵回游(鱼的) ...
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鲑鱼奋力回游到河里产卵。
The salmon fight their way back up the river to spawn.
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每年春天大批鲟鱼回游至龙门穴洞之处集结，并且在临产卵前两三天内频繁跳跃。
Each spring, large Numbers of sturgeon migrate to the Longmen grotto gathering place, and often two or three days before the temporary jump spawning.
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