1. It is less than one kilometer to the village post office.
   到村里的邮局不到一公里。
2. The city covers 20 square kilometers.
   这座城市占地20平方公里。
3. One li is equal to half a kilometer.
   一华里等于半公里。
4. He can swim two kilometer.
   他能游两公里。
5. The river is a hundred kilometers long.
   这条河一百公里长。

　1个名词解释