He wore a straw hat to keep his balding head from getting sunburned.
他戴了一顶草帽，以防止开始变秃的头被晒伤。
《柯林斯英汉双解大词典》
2
He was balding and missing a few teeth.
他秃顶了，掉了几颗牙。
3
An earnest expression, balding but with some beautiful white hair, thin lips, a sharp chin ... I remember thinking you were not handsome enough for me.