英文字典中文字典
英文字典中文字典
51ZiDian.com
中文字典辞典
英文字典
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
请输入英文单字,中文词皆可:
mesothorium
XDict
n
. 新钍
PyDict
新钍
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
Mesothorium
\
Mes
`
o
*
tho
"
ri
*
um
\,
n
. [
NL
.;
meso
-
thorium
.]
(
Chem
.)
a
radioactive
isotope
of
radium
(
radium
-
228
)
with
a
half
-
life
of
5
.
8
years
.
Also
called
{
mesothorium
-
1
}
or
{
mesothorium
I
}
to
distinguish
it
from
a
subsequent
decay
product
,
mesothorium
II
(
actinium
-
228
).
It
was
discovered
in
1907
by
Otto
Hahn
as
a
decay
product
of
thorium
(
produced
by
decay
of
thorium
-
232
).
Mesothorium
-
1
(
radium
-
228
)
in
turn
produces
actinium
-
228
(
mesothorium
-
2
)
as
the
first
product
of
its
radioactive
decay
,
and
the
actinium
-
228
in
turn
decays
quickly
(
half
-
life
of
6
hours
)
to
thorium
-
228
(
which
is
also
called
{
radiothorium
};
the
thorium
-
228
has
a
half
-
life
of
1
.
91
years
,
shorter
than
that
of
the
radium
-
228
).
It
was
discovered
and
named
before
full
recognition
of
the
nature
of
isotopes
of
the
elements
,
and
was
distinguished
from
other
variants
of
radium
by
its
half
-
life
and
mode
of
production
and
decay
.
It
was
also
cheaper
to
prepare
than
other
short
-
lived
radium
isotopes
,
and
was
thus
sold
commercially
,
for
use
,
e
.
g
.
in
making
watch
dials
readable
in
the
dark
by
painting
the
hands
and
hour
marks
with
a
self
-
luminous
paint
containing
the
radioactive
substance
;
it
is
therefore
often
referred
to
(
e
.
g
.
in
regulatory
legislation
)
as
though
distinct
from
radium
.
It
was
one
of
the
isotopes
believed
responsible
for
radiation
-
induced
diseases
observed
in
industrial
workers
who
painted
radium
on
watch
dials
in
the
late
1950
'
s
and
early
1960
'
s
.
The
primary
isotope
of
radium
(
radium
-
226
)
has
a
half
-
life
of
1620
years
,
and
these
isotopes
with
shorter
half
-
lives
proved
difficult
to
isolate
and
study
for
the
purpose
of
finding
the
cause
of
such
diseases
.
[
Webster
1913
Suppl
.
PJC
]
请选择你想看的字典辞典:
单词
字典
翻译
mesothorium
查看 mesothorium 在百度字典中的解释
百度英翻中
〔查看〕
mesothorium
查看 mesothorium 在Google字典中的解释
Google英翻中
〔查看〕
mesothorium
查看 mesothorium 在Yahoo字典中的解释
Yahoo英翻中
〔查看〕
安装中文字典英文字典查询工具!
中文字典英文字典工具:
选择颜色:
英文字典中文字典
输入中英文单字
复制到剪贴板
<!--51ZiDian.com--> <style type="text/css">#word104_1 br {display:none;}</style> <form id="word104_1" method="post" action="http://pt.goldgoldprice.com/index.php" target="_blank"> <div style="width: 140px;border:1px solid #000;background-color:#ffffff;padding: 0px 0px;margin: 0px 0px;align:center;text-align:center;overflow:hidden;"><div id="xcolor1_1" style="font-size:12px;color:#183a00;line-height:16px;font-family: arial; font-weight:bold;background:#94abf0;padding: 3px 1px;text-align:center;"><a href="http://pt.goldgoldprice.com/" alt="英文字典中文字典" title="英文字典中文字典" id="word_name104_1" style="color:#000000;font-size:14px;text-decoration:none;line-height:16px;font-family: arial;" >英文字典中文字典</a></div><table width=100% style='align:center;text-align:left;font-size:12px;background-color:#ffffff;color:#333333;'> <tr><td style="text-align:center;border:0"><input type=hidden name="word104_hi" value="1">输入中英文单字</td></tr><tr><td style="text-align:center;border:0"><input type="text" name="word104_input" value="" size=10 style="background-color:#ffffff;color:#000;text-decoration:none;font-family: arial;rial;border:1px solid #999;padding:1px!important;"></td></tr><tr style='line-height: 26px;'><td style="text-align:center;border:0"><input type=submit style="background-color:#ccc;color:#000;border:0 none;cursor:pointer;" value="查询字典"></td></tr></table></div> </form> <!--51ZiDian.com-->
英文字典中文字典相关资料:
中文字典-英文字典
2005-2009