多种目的

• Due to the range of human uses made of the watercatchment area adjacent to the great barrier reef some 400of the 3000 reefs are within a risk zone where water qualityhas declined owing to sediment and chemical runofffrom farming , and to loss of coastal wetlands which are anatural filter
  由于人们将毗邻“大堡礁”的集水处用于多种目的,在3000个礁地中有大约400个处在一个危险地带,那里的水质因农耕排放物中的沉淀物和化学排放物以及担当着天然过滤器作用的海岸湿地的流失而出现了下降。