库存周期 meaning in Chinese

inventory cycle time

There are not the jit distribution system and the zero or lack inventory operation . the inventory period of the raw materials is over 30 days with a large amount of current funds . the inventory period is a long time and the high proportion of the gross sales
由于没有实行及时配送，无法做到无库存或少库存，原材料库存周期普遍超过30天，从而占用大量流动资金；产品库存周期过长，占销售总额的比例过高；许多钢铁企业有自己的车队、自己的仓库，投入很大，成本很高，但实际效益很低。