例句
The Carboniferous period was an important era in geological history.
石炭纪在地质历史上是一个重要的时代。
Many carboniferous plants are now extinct.
许多石炭纪的植物现在已经灭绝了。
The Carboniferous period was an important era in geological history.
石炭纪在地质历史上是一个重要的时代。
Many carboniferous plants are now extinct.
许多石炭纪的植物现在已经灭绝了。