sell one's hens on a rainy day

例句：

1. 1. They sold their house to buy a bigger one.
   他们把房子卖了，买了一个更大的。
2. 2. The company is selling its products at a discount.
   这家公司正在以折扣价出售其产品。
3. 3. We need to sell the old car and buy a new one.
   我们需要卖掉旧车，买一辆新车。