他用取火镜使太阳光聚集在纸上。
He focused the sun's rays on the paper with a burning glass.
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.
如果我用取火镜聚集太阳光，即使在最寒冷的冬天，我也可以轻松燃起火来。
If I focus the rays of sun with a burning glass, even in the coldest days of winter, I can kindle a fire with ease.
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