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.
偏头痛是由于异常的血流量进入大脑引起的。
Migraine headaches are caused by abnormal blood flow to the brain.
人们喊着新品种的电灯会引起他们偏头痛和癫痫发作。
People cried that new sorts of light would give them migraine and epileptic fits.
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