graptolites笔石: graptolite单笔石类: monograptids下曲式笔石类: decurved graptolites下斜式笔石类: declined graptolites笔石: (古无脊椎动物) graptolite◇笔石纲 graptolithida; 笔石体 rhabdosome; 笔石相 graptolithic facies下载手机词典可随时随地查词查翻译