Because the sea water is more buoyant than fresh water as it contains salt, you know.
2
周围都是海水，它们的身体含有较低浓度的盐比海洋的水。
Surrounded by salt water, their bodies contain a relatively lower concentration of salt than the ocean water.
3
有咸味的水含有盐，但没有海水含量那么多，例如，在河口上游附近海水和河水交汇处就有半成水。
Brackish water is salty, but does riot have as much salt as the sea. For instance, it will be found some way up a river estuary where sea and rive water are mixed.
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