改进题：We regret the four of the items enquired for in your Fax are unfortunately not available for export.

译文：很遗憾，贵方传真所训商品有4项无货可供。

改进题：We regret the four of the items enquired for in your Fax are unfortunately not available for export.

译文：很遗憾，贵方传真所训商品有4项无货可供。

改进的译文：很遗憾，贵方传真所询的4项商品均无货可供。