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　　中英文本

　　From the depths of space, an asteroid hurtlestoward Earth. (Well, our general vicinity.)But thisis no ordinary hunk of galactic debris. Because thebody of this asteroid seems to defy gravity. It'sbound by forces never observed on this scale inspace.

　　在太空深处，一颗小行星急速驶向地球。(当然，只是驶向与我们大致邻近的区域。)这可不是块普通的银河碎片。因为这颗行星天体似乎不受地心引力的作用。它所受的凝聚力在这片太空区域中可谓前所未有。

　　That's not the plot of a new summer blockbuster. It's the result of a study in the journalNature.

　　这不是暑期大片里的一个桥段，而是《自然》杂志中发表的一项研究结论。

　　The asteroid in question is actually a kilometer-sized collection of rubble. In most cases, suchspace — faring pebble piles are held together by a combination of gravity and friction. Butnot so for our rocky interloper, dubbed "1950 DA." This asteroid is rotating so rapidly that itspieces should have flung apart long ago.

　　这个神秘的小行星事实上是个大小为一公里的碎石堆。通常，这种遨游在太空中的碎石堆是通过重力和摩擦力聚合在一起的。但我们眼前这个被命名为“1950 DA”的入侵者却不是。它旋转得如此迅速，其中的碎石块应该早被甩掉了才对。

　　Now, by analyzing the 1950 DA's temperature and density, researchers conclude thatcohesive forces called van der Waals attractions must be keeping the pieces clustered. Van derWaals forces may sound mysterious, but they're well known on the small scale for their weakinfluence within and between molecules.

　　通过分析1950 DA的温度和密度，研究人员得出这样的结论：使得碎石块凝聚在一起的肯定是范德华引力。范德华引力听起来可能有点令人费解，它因能在小范围内对分子或分子间起微小作用而闻名。

　　Blasting the asteroid, Hollywood style, could overcome these forces. But that might leave uswith hundreds of smaller killer space rocks to dodge. The good news is, the asteroid won't bein our area until 2880. So we have some time to figure it out.

　　将小行星爆破?——好莱坞大片的一贯作风，兴许能摆脱这些引力。但这样一来，我们得躲避数以百计掉落下来的致命陨石。值得高兴的是，该小行星到2880后才会远离地球。所以我们还有一些时间来找出答案。

　　词语解释

　　1.galactic debris银河碎片

　　Scientists are searching for some kind of galacticdebris.

　　科学家正在寻找某种银河碎片。

　　2.cohesive forces凝聚力

　　The Buluotuo's culture has strong cohesive forces.

　　布洛陀文化具有强大的凝聚力。

　　3. Van der Waals forces 范德华引力

　　If you can make van der Waals forces work for you, as Cutkosky has, you can climb nearly anysurface. One secret behind it is directional adhesion, and, as Cutkosky points out, geckos haveit.

　　如果你可以用范德华力做功，就想库考特斯基那样，那么你几乎可以爬上任何表面。

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