其中的一个难题是，复杂的疾病——比如偏头痛——可能由众多基因引起，也可能由其它生物化学和环境因素引起。
One problem is that complex disorders - like migraines - can be caused by multiple genes as well as by other biochemical and environmental factors.
没有单一原因引起抑郁症的。所以，抑郁症很可能是遗传、生物化学、环境和心理因素共同作用的结果。
Most likely, depression is caused by a combination of genetic, biological, environmental, and psychological factors.
从生物化学角度探讨了影响生漆成膜过程的温度、湿度、含水量等因素。
This paper has discussed, from the views of biochemistry, the factors influencing the film-forming process of Chinese lacquer, such as temperature, humidity and water content.
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