Title Text:We’ve secretly replaced this customer’s instant coffee with our patented substitute. Let’s see what she … uh oh, I think she spotted us through the window. Now she’s getting something from the closet … oh jeez, she has a sword! Run!!
Origin:https://xkcd.com/2406/
https://www.explainxkcd.com/wiki/index.php/2406:_Viral_Vector_Immunity
病毒载体免疫
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