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prototherian
US
UK
Web
原兽类
Plural Form:
prototherians
E-E
Web Definition
n.
1.
an
echidna
,
platypus
,
or
one
of
many
extinct
related
mammals
.
1.
原兽类
原兽类
(
prototherian
)哺乳动物也称为单孔类(monotrems),只包括两个现存种类---鸭嘴兽(platypus)和针鼹(echidna) …
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