英语翻译Water gets into a fish's body through osmosis.For exampl

英语翻译
Water gets into a fish's body through osmosis.For example,if there is more water outside of a cell than inside,water will try to flow into the cell until there is the same concentration of water on either side of the cell's membrane.The body of a fish acts the same way,either absorbing or losing water depending on its surroundings.
Whether a fish absorbs or loses water is based on the fact that all fish must maintain a certain amount of salt in their bodies to stay healthy.Fish that live in fresh water have a higher concentration of salt in their bodies than the surrounding water.
Ocean fish have the opposite problem.Surrounded by salt water,their bodies contain a relatively lower concentration of salt than the ocean water.In this case osmosis causes the fish to constantly lose water in order to equalize salt concentration inside and outside the fish.to partially compensate for the water loss,ocean fish actually drink water through their mouths.And to get rid of the excess salt they take in by drinking seawater,they excrete some salt through cells in their gills.