Greeting Follows Professional Characteristics.

You can use different greetings at different times, except for general & ldquo; Hello & rdquo; besides, you can also change from time to time, from person to person, from place to place. Before 10 in the morning, you can ask good morning, 10 o'clock to 12 o'clock, good morning, 12 o'clock to 14 o'clock, good afternoon, 14 o'clock to 18 o'clock, good afternoon, evening 18 to 21 o'clock, good evening. After 21 o'clock, if there is no urgent matter, d