1. Protopectin is a soluble pectin-like polysaccharide found in fruits.
原果胶是一种可溶的类似果胶的多糖，在水果中存在。

2. The conversion of protopectin to pectin during fruit ripening contributes to softening of the fruit.
在水果成熟过程中，原果胶转化为果胶，有助于水果的软化。