Senses
强壮/ 強壯 strong
strong; sturdy; robust; muscular
强壮/ 強壯 to strengthen
to make strong; to strengthen one's body or physique
强壮/ 強壯 middle-aged
(literary) refers to a person in their prime, specifically between the ages of thirty and forty
强壮/ 強壯 able-bodied people
strong and healthy people, often referring to those fit for labor or military service