focus the sun's rays on a piece of paper with a burning glass
Related Translations:
聚焦: [物理学] (使光或电子束等聚集于一点) focus; focusing; concentrate 短语和例子用取火镜使太阳光聚焦在一张纸上 focus the sun's rays on a piece of paper with a burning glass; 如果照相机镜头聚焦不准, 照片就会模糊不清。 if your camera is not brought i
