Mild traumatic brain injury, pain, and substance abuse are common.

轻度颅脑损伤，疼痛，药物滥用是常见的。

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This is the substance which could prove invaluable in treating brain injury.

这是治疗脑伤非常珍贵的物质。

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This is the substance which could prove invaluable in treating brain injury.

这是治疗脑伤非常珍贵的物质。

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