名词
中文翻译：五元环
同义词：
['pentagonal', 'cyclic', 'cyclic ring']
例句：
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1.The pentacyclic ring structureof the compound is responsible for its uniqueproperties.
这种化合物的五元环结构是其独特性质的原因。
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2. Thepentacyclic ringsystem in this plant is essentialfor its growth and reproduction.
这种植物中的五元环系统对其生长和繁殖至关重要。
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3. The pentacyclic ringstructure of the antibiotic has been studied extensivelyto understand its mechanism of action.
这种抗生素的五元环结构已被广泛研究，以了解其作用机制。