英语的男生怎么说呢

In English, a male is referred to as a "boy" when he is a child and a "man" when he is an adult. You can also use the term "gentleman" to refer to a man in a formal or respectful way. For example, you might say:
"This is my son, he's a good boy." (referring to a male child)
"That man over there is my husband." (referring to an adult male)
"The gentleman sitting next to me is my colleague." (referring to an adult male in a formal or respectful way)