save file

例句：

1. 1. We need to save water during the drought.
   在干旱期间我们需要节约用水。
2. 2. The old house is too small for our family's needs, so we need to save space.
   这所旧房子太小了，不能满足我们家庭的需求，所以我们需要节省空间。
3. 3. She saved up all her money to buy a new car.
   她把所有的钱都攒起来买了一辆新车。