21-08-26 Junk mail 垃圾邮件，指那些主动送上门的、没有用的广告信件。这个词也适用于电子邮件中的垃圾邮件。 例句 Why does no one send me real letters anymore? All I ever receive is junk mail! When I checked my email this morning there were 15 items of junk mail...

20-12-01 Many of us ponder what lies in outer space. When we look up at the night sky, we see stars, the twinkle of a moving satellite and occasionally a distant planet. But one thing we dont see is the millions of pieces of junk filling up space. Its this d...

13-08-05 Researchers from the Gene and Stem Cell Therapy Program at Sydney's Centenary Institute have confirmed that, far from being junk, the 97 per cent of human DNA that does not encode instructions for making proteins can play a significant role in contr...

11-09-02 Scientists in the US have warned Nasa that the amount of so-called space junk orbiting Earth is at tipping point. 美国科学家向宇航局警告道，地球外围太空垃圾的数量已经达到了一个临界值。 Artist's impression from the European Space Agency of debris in...

09-08-30 睡眠专家们近几年发现，现在很多青少年睡眠时间都不足4个小时，而且睡眠质量不高。甚至很多青少年都是玩着游戏睡着的，因此睡眠质量无法保证，从而影响白天的学习和工作表现。专家们把这种睡眠状态叫做junk sleep，由此可见其危害程度了。 Junk Sleep refers to low-qu...