单词 | 属头足纲动物 |
例句 | DEFINITIVE EXAMPLES 权威例句〔ammonite〕The coiled, flat, chambered fossil shell of an extinct mollusk belonging to the class Cephalopoda, which was abundant in the Cretaceous period.菊石,鹦鹉螺化石:已灭绝软体动物的螺旋形、扁平的化石外壳,属头足纲动物,大量存在于中生代美国传统 |
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