And just as their numbers were rebounding in the mid-20th century -- shooting up to 900, 1,000, 1,100, 1,200 -- just as that started happening, we started draining the southern Everglades.
它们数量一直回升到二十世纪中叶—— 数量上升到900,1000,1100,1200 就像之前发生的一样， 我们开始排干南部的大沼泽地。