问题描述：
from a more pragmatic atandpoint,evidence abounds that animal subjects are still an indispensable p
from a more pragmatic atandpoint,evidence abounds that animal subjects are still an
indispensable part of scientific research at this phase of human development.
from a more pragmatic atandpoint,evidence abounds that animal subjects are still an
indispensable part of scientific research at this phase of human development.
问题解答：
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