1. Sphenopsids are an ancient group of plants that thrived during the Carboniferous period.
蕨类植物是一种远古的植物群，在石炭纪时期繁盛生长。
2. Fossilized sphenopsid stems have been found in many coal deposits around the world.
化石化的蕨类植物茎在世界各地的煤矿床中被发现。