一个句子英翻中who understandably was the apple of his eye 是句谚语吗

完整的应该是这样吧!
BaronFitzgerald had only one child,a son,whounderstandablywasthe apple of his eye.
BaronFitzgerald仅仅有一个孩子,儿子,他很明显是他（BaronFitzgerald）的心肝宝贝.
the apple of sb's eye“某人的心肝宝贝”的意思