Well, if you sink kelp to the bottom of the deep ocean, say, 12,000 feet, it's under 5,000 pounds of pressure, for instance, just carbon dioxide under that much pressure is actually heavier than water, so gravity works everywhere, all the time, so it stays down.
是這樣的,如果海帶下沉到深海的底部,比如說 12000 英尺,它就有 5000 鎊重的壓力,光是二氧化碳在那麼大的壓力下其實比水更重,而重力在任何時候都會發揮作用,所以它會沉在底下。