英语翻译It is often difficult to keep close check on all invento

英语翻译
It is often difficult to keep close check on all inventory items in a company (due to cost considerations) and as such a decision has to be made as to which inventory items need a greater degree of control.The commonly used technique is ABC classification,which is derived from the usage value of each inventory item.In the field study,only six per cent of the companies ever used this technique to classify inventory.However,most companies have classified inventory into categories of different levels of importance,but the basis of classification differs from the one normally used in ABC analysis.The classification methods used fall into two broad categories:firstly,those based on the relative importance of inventory items on company operations; and secondly,the relative difficulty of procuring the inventory item.In the first category,manufacturers classified a crucial raw material as being more important than another item such as industrial gloves.In the second category,inventory items requiring an import licence were classified as being more important to control than items that do not require an import licence.At times the classification was based on both these factors.On most occasions these classifications were not made in any formal methodical manner,but
each company had a definite idea about which items needed to be controlled closely.In general,this type of classification did not take the inventory cost aspects into consideration.The one most important factor,considered in arriving at these arbitrary classifications,was ensuring the availability of crucial raw material and parts to meet the production programme.This is a complete departure from the conventional ABC classification,which is usually aimed at reducing inventory costs.

通常在一个公司里,很难不停地对所有库存进行详细核查（考虑到成本）因而需要决定对哪些库存需要更高程度的监控.通常采取的技巧是进行ABC分级法,根据每个库存产品的使用价值将其分类.在此领域的研究表明,仅有6%的公司曾使用过此法对库存分级.然而,绝大多数公司将库存按重要程度的不同进行分级,但分类的依据同通常采用的ABC法并不同.这种分级方法常常可归结为两大类：第一类,以公司运营过程中库存产品的重要相关性为依据；第二类,以库存产品加工的难易程度为依据.在第一类里,制造商会将关键原料作为更为重要的库存物资,如工业手套.在第二类里,对那些需要进口许可的产品进行控制更重要.通常分级时这两种因素都会考虑到.绝大多数情况下这些分级并不会按任何固定的模式去做,但每家公司都有一个明确的概念,即哪些产品应被更紧密地监控.总之,这种分级类型并没有站在库存成本的角度去考虑问题.最重要的一个因素是,通过这些主观的分级之后,确保关键原料和零件达到生产要求.这是完全背离常规的ABC分级法,通常以降低库存成本为目的.