Last Updated:2025/11/23

The old scientist held a sunglass over the tinder, concentrating the sun's rays until a spark caught.

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The old scientist held a sunglass over the tinder, concentrating the sun's rays until a spark caught.

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その老いた科学者は火口の上に集光用の凸レンズをかざし、太陽光を一点に集めて火花が飛び、着火させた。

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