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背单词
pelycosaur
pelycosaur
美
英
网络
盘龙目;盘龙类
词形变化
复数:
pelycosaurs
英汉解释
n.
1.
a
large
extinct
reptile
that
was
common
in
Europe
and
North
America
during
the
Permian
period
, 245
to
290
million
years
ago
.
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考试词汇表
maximum design pressure
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