chemical-'kemɪkəlBNC¹⁷³⁹⁹⁵⁺² 基本例句 stem.化学Chemistry化合物chemical compounds化学反应chemical reactions相关词根chem-;chemo-;chemi-;chemic-;chemico-;chemist- But the researchers found chemical- bond fingerprints of chitin- protein complex in thin, nitrogen- rich layers in both fossils. 但是研究者发现角质蛋白复合物的化学键保留的很少。富氮层在两个化石上都有所发现。 yeeyan