Parasites discovered long time ago that it is easier to suck the existing blood out of the body of living organisms than producing it from scratch.
很早以前，寄生虫就发现比起自己从头造血，从生物体吸取现成的血液更容易。
Parasites discovered long time ago that it is easier to suck the existing blood out of the body of living organisms than producing it from scratch.
很早以前，寄生虫就发现比起自己从头造血，从生物体吸取现成的血液更容易。
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