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问题: 英语翻译

直到最近医生们才弄清楚肺癌的起因。

心理压力可能是患恐慌症的主要原因之一。

只有当火车驶出车站时,他才明白他耽误了车。
(翻译以上的三句话)

解答:

1. It is not until recently that doctors find out the causes of lung cancer.

2. Mental pressure could be one of the main causes of panic disorder.

3. It was not unitl the train left the station that he realized that he missed the train.