Human life, it is mutual life, not only is the requirement and competition.
人类的生活，是互助的生活，不单是要求和争夺。
Leisure is an essential requirement for human survival.
休闲是人类生存的本质要求。
The average human sleep requirement is about 7.5 hours.
人类平均的睡眠要求是大约7.5小时。
The average human sleep requirement is about 7.5 hours.
人类平均的睡眠要求是大约7.5小时。
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