Now, this one's a must-buy and always keep in stock.

现在，这是必须购买的产品，并且始终保持库存。

He keeps a stock of medicines in the cupboard.

【stock】他在柜子里有一些备用药品。

All these things he sold, and many more besides, and what he did not keep in stock he would obtain to order.

他卖掉了所有这些东西， 还有更多的东西， 还有他没有库存的东西， 他会去订购。

She oversees a " gym" in which models that optimise different parts of Amazon's supply chain—from how many of a certain item to keep in stock to where to build new warehouses—train together to learn how to act as one coherent model.

她负责监督一个“健身房”，在这个健身房里，优化亚马逊供应链不同部分的模型（从某种商品的库存数量到在哪里建造新仓库）一起训练，学习如何作为一个连贯的模型行事。