sell a thing at auction

例句：

1. 1.They sold their old car for a good price.
   他们以好价钱卖掉了他们的旧车。
2. 2. The farmer sold his farm to the government.
   农民把他的农场卖给了政府。
3. 3.She sold her house and moved to another city.
   她卖掉了她的房子，搬到了另一个城市。