求翻译：距今约250万年-约1万年以前.这段时期的人类开始制作出石制工具,掌握了制造简单的组合工具的能力,学会了钻木取火的技能是什么意思？

About 250 million years ago - about 10,000 years ago during the period of mankind began to produce stone tools , mastered the manufacture of simple combination tool 's ability to learn the skills of fire by rubbing sticks

About 2,500,000 years - approximately 10,000 years ago. This period of mankind has begun to produce stone tools, the making of simple combination of the capabilities of the tools, to learn the stinging burn of skills

Is apart from now approximately 2,500,000 - approximately before 10,000 years. This section of time humanity starts to manufacture the stone system tool, has grasped the manufacture simple combination tool ability, has learned the skill which makes fire by boring a hole in wood

From about 2.5 million years ago to about 10,000 years ago. this period humans made stone tools, mastering the ability to manufacture simple combination tool, the skills learned to fire by rubbing sticks

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