为了吓退捕食者，这种鲨鱼可以用将胃部填满空气或水的方式使自己的身形膨胀到正常体积的两倍。
To scare off predators, this shark can balloon to twice its normal size by filling its stomach with air or water.
这些宇宙地狱在很多星系里的确存在，星系中的黑洞需要以质量数百万倍甚至数亿倍于太阳的物体来填满，而这些黑洞的体积也就太阳系那么点大。
Such galactic black holes are collapsed objects having millions or even billions of times the mass of our sun crammed into a space no larger than our Solar System.
这些宇宙地狱在很多星系里的确存在，星系中的黑洞需要以质量数百万倍甚至数亿倍于太阳的物体来填满，而这些黑洞的体积也就太阳系那么点大。
Such galactic black holes are collapsed objects having millions or even billions of times the mass of our sun crammed into a space no larger than our Solar System.
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