鱼类是最古老的脊椎动物。它们几乎栖居于地球上所有的水生环境━━从淡水的

鱼类是最古老的脊椎动物。它们几乎栖居于地球上所有的水生环境━━从淡水的湖泊、河流到咸水的大海和大洋。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. They inhabit almost all the Earth's aquatic environments ━ ━ from freshwater lakes, rivers and oceans to the salt water of the sea. 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. They are almost living in all the earth's aquatic environment - from freshwater lakes, rivers and oceans of salty sea. 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. They dwell in almost all aquatic environments on Earth--from salt water to freshwater lakes, rivers, seas and oceans. Fish are lived in year-round water, breathe through their gills, fins on the secondary balance and movements of the body temperature of vertebrates.