音标: 英 ['əʊvəˌgrəʊ] 美 ['oʊvəˌgroʊ]
1. The grazers, in their turn, keep the corals free of seaweeds and parasites that would otherwise overgrow the reef.
食草鱼又会 清除珊瑚上的海草和寄生虫 避免它们在珊瑚礁上过度生长