人体的循环系统里有一些有害的化学物质，血脑屏障是一道防御这些有害物质的天然屏障，但这道屏障同时也将治疗药物隔于脑外。
This barrier is a natural defence against potentially harmful chemicals floating around the body but has also stopped useful drugs reaching the brain as well.
人体的循环系统里有一些有害的化学物质，血脑屏障是一道防御这些有害物质的天然屏障，但这道屏障同时也将治疗药物隔于脑外。
This barrier is a natural defence against potentially harmful chemicals floating around the body but has also stopped useful drugs reaching the brain as well.
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