For example, in a gene therapy trial for X-SCID - or "bubble-boy" disease - inserting a gene in the wrong place triggered cancer in some of the recipients.

比如，在X光免疫缺陷和“泡泡男孩”疾病的基因疗法试验中，就因基因植入错误而引发了试验者的癌症。

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Though the pinky's owner has been dubbed X-woman, scientists think the pinky belonged to a child between 5 and 7 years old, but experts can't tell if it was a boy or a girl.

虽然这个小指的主人被命名为“X女性”，科学家认为这个小指是属于一个年龄在5 - 7岁之间的儿童，但专家不能断定是男孩还是女孩。

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She wheeled one boy to X-ray through the maze of hallways and elevators.

NEWYORKER: The Visitor

Originally the trials were considered a huge success when a number of patients were successfully treated for the X-linked Severe Combined Immunodeficiency Syndrome (X-Scid) which is more commonly known as the "Boy in the Bubble" syndrome.

BBC: Gene therapy 'causes leukaemia'