middle是可数名词吗

　　Take a sheet of paper and draw a line down the middle.

　　拿出一张纸，在中间画一条线。

　　She's the middle child of three.

　　三个孩子，她是老二。

　　The village has a history going back to the Middle Ages.

　　这个村子的历史可追溯至中世纪。

　　I should have finished by the middle of the week.

　　我在这周过半的时候应该就能完成。

　　His eyes were fixed on a small house in the middle distance.

　　他凝视着不远处的一座小房子。