钾

例句：

1. 1. Potatoes are rich in potassium, which is important for good health.
   土豆富含钾，对健康很重要。
2. 2. The plant requires a lot of potassium to grow well.
   这种植物需要大量的钾才能生长良好。
3. 3. Potassium chloride is used as a preservative in food and medicine.
   氯化钾被用作食品和药品的防腐剂。