Edible pod pea and parchmented pod pea are two different types of pea according to whether they have a hard membrane (parchment) in pod or not.
豌豆根据荚皮类型可分为硬荚豌豆和软荚豌豆,二者的区别在于荚皮中有无革质膜。
参考来源 - 豌豆革质膜形成机理的研究与不同播种期对豌豆苗产量性状的影响·2,447,543篇论文数据，部分数据来源于NoteExpress
N-UNCOUNT In former times, parchment was the skin of a sheep or goat that was used for writing on. 羊皮纸
...old manuscripts written on parchment.
...书写在羊皮纸上的旧手稿。
N-UNCOUNT Parchment is a kind of thick yellowish paper. 仿羊皮纸
...an old lamp with a parchment shade.
...装着仿羊皮纸灯罩的一盏旧台灯。
The pile of parchments was formidably high.
那堆羊皮纸高的惊人。
One wall was lined with bookshelves and bins stacked with old scrolls and parchments;
一面墙排满了书架和装满了卷轴和羊皮纸的罐子；
All that stuff about lost parchments, hidden geometry, and puzzles made for great sales.
那内容关于丢失的羊皮纸书卷，影藏的几何学，和谜语们，汇集起来卖了很大书。
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