美泰玩具召回中國(guó)產(chǎn)產(chǎn)品
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科學(xué)60秒:飛行的代價(jià)
More than 60 mammal species—like the famous flying squirrel—have adapted the ability to sail from tree to tree. , yes. But what’s the evolutionary advantage? One theory suggests gliding save...
CNN 新聞100篇 News Item 56
CNNIt was supposed to be the greatest science experiment ever, and it's certainly the most expensive. The large hadron collider designed to recreate the Big Bang theory with colliding particles h...
CNN新聞100篇 News Item 43
CNNWe are getting things started with START. It stands for Strategic Arms Reduction Treaty. It's an agreement between the United States and Russia for both countries to reduce the number of nucle...
尋找西部淘金熱時(shí)期的定居者
The problem of slavery continued to divide the North and South. Northerners warned that slavery could spread no farther. Southerners threatened to leave the Union unless southern rights were pro...