The students and the teacher greet each other when they meet. They use different greetings
politely at different times of the day. They say "Good morning/Hi/Hello/Good afternoon/Goodbye
/Bye." to each other.
同学们和老师见面时互相打招呼。他们在一天中的不同时间礼貌地使用不同的问候语。
他们互相之间说声 “早上好/嗨/你好/下午好/再见/再会。”。(答案不唯一)