经过多年研究，伽利略已经学会如何反射和折射光线，以及如何让观察者通过望远镜看到两小时航程外的船只。他用望远镜遥望夜空，成了观察到木星的卫星和月球上火山的第一人。

UNITED NATIONS, June 3 (Xinhua) -- A UN spokesman on Tuesday condemned an attack that killed five UN aid convoy workers in Sudan.

The office said that in North Gaza, the Noura Al Kaabi Center for Dialysis was reportedly hit. The health authorities in Gaza reported that more than 40 percent of dialysis patients in Gaza have died ...