求翻译：Cu的加入，使合金的组织得到了明显地细化，合金的力学性能也得到了提高，而且随着Cu含量的增加，合金的抗拉强度在铸态条件下均呈不同的变化趋势是什么意思？

cu joining alloy has been significantly refined, and the mechanical properties has also been improved, and along with cu content increases, the tensile strength showed different trends in the cast

The Cu joined the Organization, the alloy has been clearly refined, alloy of mechanics performance has also been enhanced, and, as Cu increases tensile strength of the alloy, cast in the State are in different trends of changes

Cu joined, enable the alloy the organization to obtain the refinement, the alloy mechanics performance also obtained the enhancement obviously, moreover along with the Cu content increase, the alloy tensile strength assumed the different change tendency under the cast condition condition

Joining of Cu, alloy organizations are obviously fine, and improved mechanical properties of the alloy, and increases the content of Cu, alloy in tensile strength of cast under a different change trend

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