it is known to all that smoking is harmful to one's health “ that” 作什么成分啊?

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• it is known to all that smoking is harmful to one's health “ that” 作什么成分啊?
• it is known to all that smoking is harmful to one's health “ that” 作什么成分啊?
• 求翻译 One theory is that with decreased exposure to sunlight,the biological clock that regulates mood,sleep,and hormones is delayed,running more slowly in winter.Exposure to light may reset the biological clock.Another theory is that brain chemicals that transmit information between nerves,called neurotransmitters (for example,serotonin),may be altered in individuals with SAD.It is believed that exposure to light can correct these imbalances.Chen says p
• be known for/as/with/to分别什么意思?如题