1. The gases may puff up the belly in particular. 气体尤其会在腹部鼓胀起来。
2. That boy puff up himself in front of the girls. 那男孩在女孩面前吹捧自已。
3. Whatever the mechanism, the cooler the surface, the less energy there is to "puff up" the sun. 无论这里面的机制如何，表层越冷，太阳的输出能量就越少。
4. The same muscles puff up the feathers of birds and the fur of mammals on cold days to help keep them warm. 在鸟类中也有同样的肌肉，在冬天它使得鸟的羽毛膨胀，以达到御寒的目的。 哺乳动物也通过毛发来御寒。
5. It's awfully easy for a man to puff up his chest and put on a show, but how can you know if he is a real man worth dating? 男人鼓出胸肌、秀出肌肉很容易，但是你要怎么知道他是不是一个值得交往的男子汉呢？ 男子汉愿意毫不犹豫采取行动男子汉事事就征求你的允许；
