It was a young boy with a black fin placed on his head!
那是一个头顶著一只黑色鱼鳍的男孩！
The lifeguard saw a black fin in the water and sounded the alarm to warn the children to get out of the water.
救生员看到水中有一只黑色的鱼鳍，并拉响警报警告孩子们从水中离开。
The first dorsal fin is black at the front.
第一个（刺背鳍是在前面的黑。
Dietary myo-inositol deficiency in aquatic animals leads to symptoms such as a sharp decrease on the rate of growth, surface hyperemia, fin erosion, black body color, fatty liver disease.
饲料中肌醇缺乏导致水生动物生长不良、体表充血、鳍条糜烂、体色发黑、脂肪肝等症状。
Dietary myo-inositol deficiency in aquatic animals leads to symptoms such as a sharp decrease on the rate of growth, surface hyperemia, fin erosion, black body color, fatty liver disease.
饲料中肌醇缺乏导致水生动物生长不良、体表充血、鳍条糜烂、体色发黑、脂肪肝等症状。
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