Some 70 percent of the earth's surface is water, but most of that is undrinkable seawater.
Some 70 percent of the earth's surface is water, but most of that is undrinkable seawater.
的地球表面是水，但是它大部分是不能喝的海水。
Some 70 percent of the earth's surface is water, but most of that is undrinkable seawater.
的地球表面是水，但是它大部分是不能喝的海水。