取火是指取得火种。
我们应当如钻木取火一般，全神贯注，坚持不息。
如果你用取火镜使太阳光线聚焦在干木头上，木头就会燃烧起来。
If you focus the sun's rays on dry wood with a burning-glass, it will start burning.
渐渐地，他们学会通过镶嵌石地板、在入口砌墙、设置取火点来改善洞穴。
Gradually, they learned to improve their caves with inlaid stone floors, walls at the entrances and fireplaces.
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