but nutrients alone can not support life. 但只有养分并不能维持生命
They can send sound signals to one another, above the roar of the ocean 他们可以通过拍打海面 制造超越海洋轰鸣的的声音
and only vigorous panting can prevent the birds from fatal overheating. 黑喉鸬鹚只好加速呼吸避免中暑
A herd can clear a patch of seagrass the size of a football pitch in a single day. 这群儒艮可以在一天内吃掉足球场般大小的海草
Food is not evenly distributed in the tropical shallow seas and it can take a lot of finding 食物在热带海域的分布并不平均 所以要找到食物也不容易
They can be three meters long and weigh half a ton 可以长到3米长,半吨重
At their lushest they can transform the sea bed into an underwater meadow. 这种蓬勃的长势可以把海床覆盖在下面
and they can also help in clearing away sand when searching for food. 并且它的胸鳍还可以在找寻食物的时候清理砂子
and there the snakes can catch them 那里,海蛇就能抓住它们了