boy

1. N-COUNT A boy is a child who will grow up to be a man. 男孩

He was still just a boy. 他还只是个男孩。

2. N-COUNT You can refer to a young man as a boy, especially when talking about relationships between boys and girls. 小伙子

...the age when girls get interested in boys. …女孩儿开始对小伙子感兴趣的年纪。

3. N-COUNT Someone's boy is their son. 儿子[非正式]

Eric was my cousin Edward's boy. 埃里克是我堂兄爱德华的儿子。

4. N-COUNT You can refer to a man as a boy, especially when you are talking about him in an affectionate way. 小伙儿[非正式]

...the local boy who made president. …那个当上总统的本地小伙儿。

5. INTERJ Some people say "boy" or "oh boy" in order to express feelings of excitement or admiration. 好家伙 (表示兴奋或羡慕)[美国英语] [非正式]

Oh boy! what resourceful children I have. 好家伙！我的孩子们多机智啊。