学校全年开放？(2)

污染干扰老年人思维

环境污染有害健康People who live in polluted cities can see the grit and dirt produced from vehicle engines but some of the most damaging emissions are only now starting to be understood. They’re...

美科学家发现猛犸象化石 (2)

Harris; ZedHarris is chief curator at the Page Museum, which houses treasures from the tar pits. He says only partial remains of mammoths were found at this site before, and Zed is thelargest eve...

整洁的农场 远离乳腺癌 (2)

Ynte Schukken SchukkenThe same is true for milking machines, milking areas and pasture lands -- the cleaner the better, he says. Milkers should always wash their hands. And, in the United States,...

农场看护好手——小驴 (2)

Hints: the Bureau of Land Management; Robin RivelloPeople may have the idea that burros and donkeys do not like being told what to do. But experts say the animals are not being stubborn; they jus...