通过对成本模型的分析，找出了VMI在开始阶段难以实施的原因。
Through an analysis of model, reason why VMI is difficult to implement at the beginning has been found out.
我第一次听到这个优秀的、但却难以实施的建议时，我刚好在经受一种可怕的嫉妒。
The first time I heard this excellent, if hard-to-implement, advice, I was suffering from a terrible case of envy.
相反，它运用了一种与企业达成的自愿检验协议政策，尽管这种协议在法律上是难以实施的。
Instead, it had adopted a policy of negotiating voluntary testing agreements with industry, though the agreements were not legally enforceable.
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