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Why do we usually add morning or afternoon when the second grade math indicates time?
Clearly indicate a certain moment.

In the second grade mathematics, in order to express a certain moment more clearly, morning or afternoon is usually added to indicate the time, for example, because there are 9 am and 9 pm in a day.

Afternoon refers to the period from noon 12 to 18, and generally refers to the period from noon 12 to sunset, as opposed to morning.

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