This is because, according to Archimedes' principle of displacement, floating objects displace their own weight in water.
这是因为，根据阿基米德的位移原理，漂浮物在水中会转移自身的重量。
2
Melting sea ice affects ecosystems and currents. It does not affect sea levels, because floating ice is already displacing water of a weight equal to its own.
融化的海冰影响着生态系统和水流，但它不影响海平面，因为浮冰已经置换了相同重量的水。
3
2 non-floating ice (which is not subject to Archimedes's principle that it displaces its own weight of water) would be converted into floating ice (which is), and the sea level would rise.