Think of it as preventive medicine...for the nation's aquatic life.

把这看作水生生物的预防药吧。

Amy was ordered off at once, and provided with something to ward off danger, she departed in great state, with Jo and Laurie as escort.

艾米为避免染病，吃了些预防药后，被命令立即，有乔和劳里护送，走得很隆重。