You can hear people talking or singing loudly, and they are having a good time.
你能听到人们大声的交谈和唱歌，他们玩得很尽兴。
No talking or laughing loudly so as to interrupting others' work or study. Don't do anything unrelated to work. Never return to the apartment or get off work during the working time.
校园内不得吸烟，在岗不大声说笑影响他人学习工作，工作时间不做与教育教学无关的事。
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