It is from the mono-focalization that makes euphemism an indirect way of expressing meaning with the target domain hidden while the source domain prominent.

• 并从认知聚焦的角度，进一步说明委婉语实现委婉表达及其特有的语言魅力在于施喻者从单聚焦的角度使目标域隐性化，始源域突显化。