naphthacene

例句：

1. 1. The naphthalene moleculehas a unique structure that makes it difficultto synthesize.
   萘分子具有独特的结构，这使得其合成非常困难。
2. 2. Naphthalene is used in the productionof lubricants and as asolvent for various chemicals.
   萘用于生产润滑油和各种化学品的溶剂。
3. 3. Thediscovery of naphthalene in ancient Egypt was asignificant breakthrough in the field oforganic chemistry.
   古埃及发现萘是有机化学领域的一个重要突破。