【zhu】評論
Every day, around 4,000 hippos were depositing about 8,500 kilograms of waste into the Mara along a short 100-kilometer stretch of river.每天，大約4,000隻河馬在短短的100公里長的河流中向馬拉河留下了大約8,500公斤的廢物。(B)decimate翻譯：毀滅，大量殺戮；大幅削減。(C)decompose翻譯：（使）腐化，（使）腐爛, （使）分解，（使）分化。(D)deploying部署