Dolphins are mammals., 海豚是哺乳類動物。, They breathe air through a blowhole on top of their heads., 牠們透過頭頂的呼吸孔呼吸空氣。, The air goes into their lungs., 空氣會進入牠們的肺部。, They can hold their breath for about, 牠們可以屏住呼吸大約……, mammals, 哺乳類, breathe, 呼吸, air, 空氣, lungs, 肺, hold breath, 屏住呼吸.

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