名词
中文翻译：马科动物
同义词：
['horse', 'mammal例句：1. The horse is the most popular mode of transportation in the world.（马是世界上最受欢迎的交通工具。）']
例句：
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1. The horse is the most popular mode of transportation in the world.
马是世界上最受欢迎的交通工具。
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2. The mammals are the only animals that can live in water.
哺乳动物是唯一能在水里生活的动物。
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3. The horse has been used for thousands of years as a symbol of strength and courage.
马几千年来一直被用作力量和勇气的象征。