counting

例句：

1. 1.We need to count the number of people in the room.
   我们需要数一下房间里的人数。
2. 2. The teacher counted each student's name as they entered the classroom.
   老师在学生们进入教室时一一报出他们的名字。
3. 3. She counted the change from her wallet and paid for the meal.
   她从钱包里数了数零钱，付了饭钱。