He focused the sun's ray on a piece of paper with a burning-glass.
他用一面凸透镜把阳光在纸上聚成焦点。
He focused the sun's ray on a piece of paper with a burning-glass.
他用一面凸透镜把阳光在纸上集成焦点。
The first season is also available on DVD and Blu-ray on Tuesday.
第一季的DVD与蓝光碟也将在下周二正式发售。
The first season is also available on DVD and Blu-ray on Tuesday.
第一季的DVD与蓝光碟也将在下周二正式发售。
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