... pentacyclic compound 五环化合物 pentacyclic ring 五环 pentacyclic triterpane 五环三萜烷 ...
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Olympic pentacyclic ring is symbolizing five continents' unity, world athlete by fair, frank competition and friendly spirit, meets at the Olympic Games.
奥运五环象征着五大洲的团结,世界的运动员以公平,坦率和友好的竞争精神,在奥运会上见面。
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