backpack pump

例句：

1. 1. The backpack pump is a must-have for hiking trips.
   背包泵是徒步旅行的必备品。
2. 2. He used the backpack pump to clean his clothes before going out.
   他使用背包泵在出门前清洗了他的衣服。
3. 3. The backpack pump was so powerful that it could pump water from a lake in just a few minutes.
   背包泵非常强大，可以在几分钟内从湖中抽水。