Definition: a person or animal that has grown to full size and strength Level: A1
我哥哥现在是个成年人了。
My brother is an ___adult now.
独自开车必须是成年人。
You must be an ___adult to drive a car alone.
在博物馆，成年人需要买票。
At the museum, ___adults need to buy a ticket.
