The weather forecast is for showers and overcast skies...天气预报上说多云并伴有阵雨。The night skies will be aglow with fireworks.焰火将点亮夜空。The weather was at its worst; bitterly cold, with leaden skies that gave minimum visibility.天气极其...
透镜会把图片放大，就像在看巨大的电视屏幕一样。A lens would magnify the picture so it would be like looking at a large TV screen.这大概是因为胶合透镜会因温度变化而变形.Probably because the cemented lenses are distorted by temperature variations.我们用一块负透镜,它将使光线发散一些...