单词：principal chain
principal chain的用法和样例：
例句
- Silanes consist of a chain of silicon atoms covalently bound to hydrogen atoms.构成硅烷烃的是一条硅原子链接形成的主链和以共价键链接在主链上的氢原子。
- The effects of chain flexibility and tacticity on the glass transition of PP have also been investigated.并分析了聚丙烯主链柔顺性和立构规整度对高分子玻璃化转变的影响。
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