This is mainly because it is a large molecule, and has difficulty passing through the blood-brain barrier which protects the brain from potentially harmful compounds in the blood.
这主要是因为它是一种大分子物质，要穿过保护大脑免受血液中可能有害化合物入侵的血脑屏障很困难。
A very large molecule, such as a polymer or protein, consisting of many smaller structural units linked together.
大分子一种很大的分子，如聚合物或蛋白质，由许多小的结构单位结合而成。
Two types of amphiprotic high-molecular coagulants ie APAM and CGAAC were successfully synthesized by large molecule modification process.
通过大分子改性的方法，合成了两种两性高分子絮凝剂APAM和CGAAC。
The blood-brain barrier excludes from the brain 100% of large-molecule therapeutic factor and more than 98% of small-molecule drugs.
血脑屏障的存在使得几乎所有的大分子治疗因子和超过98%的小分子药物难以到达脑组织发挥其治疗作用。
The blood-brain barrier excludes from the brain 100% of large-molecule therapeutic factor and more than 98% of small-molecule drugs.
血脑屏障的存在使得几乎所有的大分子治疗因子和超过98%的小分子药物难以到达脑组织发挥其治疗作用。
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