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pinpoint the cause of
to discover or explain the cause of sth exactly
准确地发现或解释某事的原因
The doctor istrying to pinpoint the cause of my headaches.
医生正设法查明我头痛的原因。
get to the root of
to understand the cause or source of something
了解某事物的起因或来源
The doctor says we need to get to the root of my migraines before we can start treating them.
医生说我们需要找到偏头痛的根源，然后才能开始治疗。
get to the bottom of
discover the real but sometimes hidden reason
发现(隐藏的)真实原因
I don't know exactly what's causing my migraines, but I'm determined to get to the bottom of it.
我不知道到底是什么导致了我的偏头痛，但我决心要把它根治好。
