translation.en: And they call them a swellshark because if they're threatened, they can gulp down water and blow up like an inner tube, about twice their size, and wedge themselves under a rock, so they don't get eaten by a predator.
translation.zh: 它们也称自己膨胀鲨，因为 如果它们受到威胁时， 它们可以吞咽水，并让身体 扩大像一个充气内胎， 大约扩大它们身体的两倍， 并且把自己抵在岩石下， 这样，它们不会被捕食者吃掉。