中文：

周转库存指的是企业为满足生产或销售需求而保持的库存量。这种库存量通常会根据企业的生产和销售计划进行周期性的补充和更新，以确保企业的生产和销售能够持续、稳定地进行。

具体来说，周转库存通常包括原材料、半成品、成品等库存。这些库存是为了保证企业能够及时生产或销售产品而储备的，通常需要在企业内部的各个生产或销售环节中进行流转。

周转库存对于企业的生产和销售至关重要。如果企业的周转库存不足，就会导致生产或销售的中断或延迟，从而影响企业的经济效益。但是，如果企业的周转库存过多，就会占用大量的流动资金，增加企业的财务压力和运营成本。

因此，企业需要根据自身的生产和销售情况，合理地制定周转库存计划，以确保企业的生产和销售能够持续、稳定地进行。同时，企业也需要采用现代化的库存管理技术，如实时库存跟踪、库存预警等，以提高库存管理的效率和准确性。

英文：

Working inventory refers to the inventory that enterprises maintain to meet the production or sales requirements. This inventory is usually periodically replenished and updated according to the production and sales plans of the enterprises to ensure continuous and stable production and sales.

Specifically, working inventory usually includes raw materials, semi-finished products, and finished products. This inventory is reserved to ensure that enterprises can produce or sell products in a timely manner, and usually needs to be circulated in various production or sales links within the enterprise.

Working inventory is crucial to the production and sales of enterprises. If the working inventory of an enterprise is insufficient, it will lead to the interruption or delay of production or sales, thus affecting the economic benefits of the enterprise. However, if the working inventory of an enterprise is too large, it will occupy a large amount of liquidity, increasing the financial pressure and operating costs of the enterprise.

Therefore, enterprises need to reasonably develop working inventory plans based on their own production and sales situation to ensure continuous and stable production and sales. At the same time, enterprises also need to adopt modern inventory management techniques, such as real-time inventory tracking, inventory early warning, etc., to improve the efficiency and accuracy of inventory management.