设计师对产品外观做了几处精细的改进，让它看起来更高级。

The designer made several ___refinements to the product's appearance to make it look more sophisticated.

他的言谈举止显示出良好的教养和优雅的品味。

His speech and behavior display the ___refinements of a well-educated gentleman.

黄金经过多次提炼后纯度更高了。

The ___refinements of gold have increased its purity significantly.