一个炎热的下午,爸爸在太阳下拿着放大镜摆弄着。我凑过去看。爸爸将放大镜对着太阳调整角度,使光成为一个小亮点。爸爸让这个小亮点对准纸上的一个黑点,一会儿,纸燃起来了!我拿来一张白纸和一个放大镜,也想把纸点燃。我等了许久,纸还是什么变化都没有。这是怎么回事?我突然想起爸爸的纸上有一个小黑点,要让放大镜聚集的光瞄准 On a hot afternoon, my father plays with a magnifying glass under the sun. I’ve got to see it. Dad adjusts the magnifying glass to the sun to make the light a little bright spot. Dad made this little bright spot point to a black dot on the paper. For a while, the paper was burning! I took a piece of white paper and a magnifying glass and tried to light the paper. I waited for a long time, nothing changed in the paper or. What’s going on? I suddenly remembered Papa’s paper has a little black spots, let the magnifying glass gathered light aiming