鱼类是最古老的脊椎动物。鱼类是终年生活在水中，用鳃呼吸，用鳍辅助身体平

鱼类是最古老的脊椎动物。鱼类是终年生活在水中，用鳃呼吸，用鳍辅助身体平衡与运动的变温脊椎动物。

結果 (英文) 1:

Fish is the oldest vertebrates. Fish is a year-round living in the water, breathe with gills, fins help the body with balance and movement variable temperature vertebrates.

結果 (英文) 2:

Fish is the most ancient vertebrate. Fish live in water is all the year round, breathing with gills, fins with ectothermic vertebrate body balance and movement.

結果 (英文) 3:

Fish is one of the oldest vertebrates. Fish are lived in year-round water, breathe through their gills, fins on the secondary balance and movements of the body temperature of vertebrates.