marine swimming training 海上游泳训练
Marine mammals have the misfortune to be swimming aggregates of commodities that humans want: fur, oil and meat.
这些哺乳动物不幸成为人类所需要的一堆游动着的商品，如皮毛、油和肉。
Sea butterfly: a swimming predatory Marine sea snail.
海蝴蝶：一只正在游动的食肉性海蜗牛。
Sea butterfly: a swimming predatory Marine sea snail. They have two wing-like outgrowths (lower right) derived from their foot, which they continually flap to swim through the water.
海蝴蝶：一只正在游动的食肉性海蜗牛。它们拥有像翅膀一样的由足进化而来的侧翼(位于右下方)，并靠拍打侧翼在水中前行。
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