科學(xué)60秒: “身負(fù)重任”的中世紀(jì)盔甲

Medieval armor certainly looks heavy. And now researchers have demonstrated how the protection might have put its wearers at a heavy disadvantage on the battlefield. An armored combatant in the...

背誦美文——動物的羅盤

Animals’ CompassesResearchers have found that migrating animals use a variety of inner compasses to help them navigate. Some steer by the position of the Sun. Others navigate by the stars. Some ...

一位值得紀(jì)念的希臘人

短文Diogenes was a famous Greek philosopher of the fourth century B.C.,who established the philosophy of cynicism.He often walked about in the daytime holding a lighted lantern,peering around as ...

紀(jì)念日演唱會悼念逝者(1)

華盛頓市中心舉行了一場大型的演唱會悼念逝者It is a huge event, drawing hundreds of thousands of people to the West Lawn of the Capitol building in the heart of Washington. The concert is seen thro...