例句與造句

1. Benzylisoquinoline alkaloids are the major important natural serial alkaloids with diverse structural skeletons
   摘要芐基異喹啉類生物堿是自然界中很重要的一類生物堿，數(shù)量多，結(jié)構(gòu)類型復(fù)雜。
2. It's difficult to find structural skeleton in a sentence. 用structural skeleton造句挺難的