1·Manatees, aquatic mammals inhabiting Florida's rivers and coastal waters, swim close to the surface and are frequently killed in collisions with boats.
海牛是生活在佛罗里达河流和沿海水域的水生哺乳动物，它们游到海面附近，经常在与船只相撞时被撞死。
2·I had often watched manatees in these warm coastal waters, but I'd never seen one act like this before.
在这片温暖的海域，我经常看见海牛，但是从没见过它们有这么怪异的举动。
3·In such places red tides tend to form, some producing toxins that get into the food chain through shellfish and rise up to kill bigger fish (if there are any left), birds and even seals and manatees.
在这样的地方赤潮容易形成，有些会产生毒素，毒素通过贝壳动物进入食物链，并且增多而杀死较大的鱼(如果还有任何剩下来的话)、鸟，甚至海豹和海牛。
4·Many are large animals, such as rhinos, tapirs, elephants, dugongs and manatees.
它们中的许多都是大型哺乳动物，比如犀牛、貘、大象、儒艮和海牛。
5·I pushed on through the shoal water, but now the manatees were also moving toward me.
我穿过浅水区域，继续向它们走进，但同时，这2只海牛也向我游来。