He focused the sunlight onto a piece of paper using a convex lens (burning-glass).
他用一面凸透镜把阳光在纸上聚成焦点。
| Expression | 他用一面凸透镜把阳光在纸上聚成焦点。 |
|---|---|
| Meaning | He focused the sun's ray on a piece of paper with a burning-glass. |
| Reading | tā yòng yīmiàn tūtòujìng bǎ yángguāng zài zhǐ shàng jù chéng jiāodiǎn |
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