1. The pinyin for pea is wān dòu.

2. Pea is an annual climbing herb in the Fabaceae family, 0.5-2 meters tall. The whole plant is green, smooth and glabrous, pruinose. Leaves with 4-6 leaflets, stipules cordate, lower margin with fine teeth. Leaflets ovoid; flowers solitary in leaf axils or several arranged in racemes; calyx campanulate, lobes lanceolate.

3, native to the Mediterranean and Central Asia, is one of the world's important cultivated crops. Seeds and young pods, seedlings are edible; seeds contain starch, oil, can be used for medicinal purposes, strong, diuretic, diarrhea effect; stems and leaves can be cool and relieve summer heat, and for green manure, fodder or fuel.