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| 51. | Through this idea, the alchemists connected the life activity of human body to the natural materials |
| 通过这种意识服石炼丹者将丹砂、金等自然物质的某些特殊属性与人体的生命活动联系起来,强化了他们对长生不老的信仰和追求。 |
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| 52. | We all know that normal human daily cycle of activity is of some7-8 hours' sleep alternating with some16 |
| 我们都清楚正常人每天的活动周期是大约7-8个小时睡眠和16-17个小时清醒轮流相互交替，我么也知道，一般来说，睡眠常在夜间进行。 |
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