Alô, ngoài đó có mưa không?
Đó là cách liên lạc thường thấy của các thầy cô giáo lớp cắm bản Trường tiểu học Trung Sơn, xã Trung Sơn, huyện Yên Lập (Phú Thọ) khi muốn biết tình hình ngoài huyện.
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