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单词
promethium
释义
pro·me·thium
BrE
/
prəˈmiːθiəm
/
NAmE
/
prəˈmiːθiəm
/
noun
[
U
]
(
symbol
Pm
)
a
chemical
element
.
Promethium
is
a
radioactive
metal that was first produced artificially in a nuclear
reactor
and
is
found
in
small
amounts
in
nature
钷(放射性化学元素)
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更新时间:2026/10/10 2:13:49