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单词
primordium
释义
primordium
/praiˈmɔ:diəm/
n.
(
pl.
primordia
/-diə/
)
Biol.
an organ or tissue in the early stages of development
【生】原基
[Latin, neut. of
primordius
‘original’, from
primus
‘first’ +
ordiri
‘begin’]
随便看
up-and-over
up and running
up-and-under
Upanishad
upas
up a stump
up a tree
upbeat
upbraid
upbraiding
upbringing
upcast
upchuck
upcoming
up-country
update
updraught
upend
upfield
upfold
up for
up for grabs
upfront
upgrade
upgradeable
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更新时间:2026/9/8 1:18:43