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carboniferous period
石炭纪
常用释义
词性释义
石炭纪
例句
全部
Much
of the
petroleum
we
use
today
began
some
200
million
years
ago in
the
Carboniferous
Period
.
我们今天使用的很多石油都起至200万年前的石炭纪。
Carboniferous
period
,
the
early
gymnosperms
(
such
as
etc.
)
is
very
impressive
,
but
the
number
of
ferns
most
abundant
.
石炭纪时，早期的裸子植物（如苏铁、松柏、银杏等）非常引人注目，但蕨类植物的数量最为丰富。
This
eventually
resulted
in
the
oxygen
-rich
atmosphere
of
the
Carboniferous
period
around
340
to
280
million
years
ago
.
这导致在距今2.8到3.4亿年前的石炭纪大气中的氧气几近饱和。
Selection
and
Evaluation for the Mining
Methods
of
High
and
Extra
-highSeam of
Carboniferous
Period
in
Datong
Coal
Field
大同煤田石炭系厚及特厚煤层采煤方法的选择
cone
-bearing
gymnosperms
dating
from
the
Carboniferous
period
;
产生于石炭纪的有球果的裸子植物；