打火石

例句：

1. 1. The old man used to use a piece of dry grass as a fire starter in his fireplace.
   这位老人过去常在壁炉里用一块干草作为点火器。
2. 2. She found a small rock that worked perfectly as a fire starter for her campfire.
   她找到了一个小石头，非常适合她的篝火点火。
3. 3. The fire started easily with the tinder and kindling he had gathered.
   他收集的木柴和引火物很容易点燃了火。