介绍:
In the United States it is not customary to call someone very early in the morning. If you call him early in the day, while he is shaving or having breakfast, the time of the call shows that the matter is very important and requires immediate attention. The same meaning is attached to phone calls made after 11:00 pm. If someone receives a call during sleeping hours, he assumes it is a matter of life and death. The time chosen for the call communicates its importance. 2017.10.30
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