求翻译：在这15家中包括两家以前已按到其它科威特发来的这个招标文件的公司，其中胜机石油机械公司因为已有科威特公司独家代理了这个招标，所以无法报价给我们，但经询问，他们也在焊接上存在问题。是什么意思？

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In this 15 including two before according to arrived this tender document company which other Kuwait sends in, in which wins machine the petroleum mechanical company because had Kuwaiti Corporation sole agent this tender, therefore is unable to quote price to us, but passes through the inquiry, they

In this 15 homes included two previously by other Kuwait the tender documents from the company, in which petroleum machinery company wins machine because there was already Kuwait MTV this tender, it is impossible to quote us, but upon request, they also existed on the welding problems.