Chiếc đồng hồ Bưu điện
PTO- Không cần phải nói, ai cũng biết đồng hồ là cái máy đo đếm thời gian. Nhìn vào đồng hồ để biết thời điểm này là mấy giờ, thời điểm kia là mấy giờ.
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