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How many times do you say "backwards" in the countdown to primary school mathematics?
Primary school only learned the first number, so primary school read four tones.

Countdown: ao, countdown.

Countdown: d ℉ o, the sum of two numbers is one.

China's culture is profound and profound, which should be judged according to its specific meaning and connotation. The words used in each sentence have different reasons, so it is suggested to judge them according to the artistic conception.