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1·The crustacean deposits its young on the salp barrel, in a phenomenon called demarsupiation.

这种甲壳纲动物将幼虫放在樽海鞘桶中，这种现象被称为demarsupiation。

2·The salp is barrel-shaped and moves by contracting, pumping water through its gelatinous body.

樽海鞘这种生物呈筒状，通过全身收缩、排出海水来推动自己凝胶状的身体移动。