Well, this is an approach that's been used in a variety of vaccines, most successfully with Hepatitis B, so the problem is where do you get these proteins?
这种方式,已经为许多种疫苗使用,乙型肝炎疫苗是最成功的,但问题是该从哪里获得这些蛋白质呢
Because if B was just another word for, another way of talking about, A, then to imagine A existing but B not existing would be imagining A existing but-- well, B is just A--A not existing.
因为如果B只是,A的另一种表达方式,那么认为A存在而,B不存在就是认为A存在但,B,也就是A,却不存在
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