科学家研究过鱼类远距离回游的现象。
Scientists have studied the migration of fish over long distances.
狡猾的海狮不断吞吃回游的三文鱼，让鱼类生物学家十分困惑。
Crafty Sea Lion Befuddles Fish Biologists by Continuing to Munch on Migrating Salmon.
将填写好的手册和一袋垃圾交回游客中心。
Return your completed handbook and a bag of rubbish to the Visitor Center.
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