stock in trade

例句：

1. 1. We need to check our stock in trade before we make a purchase.
   在我们购买之前，我们需要检查一下我们的库存。
2. 2. The company is constantly stocking up on supplies for the upcoming winter.
   这家公司一直在为即将到来的冬天储备物资。
3. 3. The manager has been stocking up on supplies at the warehouse.
   经理一直在仓库里囤积物资。