Some NPCNPCs allow 你you to bring a certain amount and combination of 物品items and receive something else in return. 这通常（但并非总是）需要先完成一个任务。This typically, but not always, requires a quest to be completed first. Many of them involve Plants, but some involve 宝石Gems or Hides. 这可以随心所欲地重复进行，如果你真的需要这些物品且这是获得它们的唯一途径，就可能需要为此‘刷’个不停。This can be repeated as often as you like, which if you really need the items and this is the only way to get them, can result in needing to "grind" for them.
Alternatively, see :