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They only travel up rivers to breed .
牠们只有为了繁殖才会溯河而上。
youdao
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Migrating up rivers from the sea to breed in fresh water. Used of fish.
从海洋向上游到河流中，并在淡水中产卵的。用于指鱼。
youdao
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Migrating up rivers from the sea to breed in fresh water. Used of fish.
从海洋向上游到河流中，并在淡水中产卵的。用于指鱼。
youdao