简介:【原文】Butlet'sstepbackforasecondhereandexplainwhatgravitationalwavesactuallyare.AccordingtoEinstein'stheory,thefabricofspace-timecanbecomecurvedbyanythingmassiveintheUniverse.Whencataclysmiceventshappen,suchasblackholesmergingorstarsex-ploding,thesecurvescanrippleoutelsewhereasgravitationalwaves,justlikeifsomeonehaddroppedastoneinapond.BythetimethoseripplesgettousonEarth,they'retiny(aroundabillionthofthediam-eterofanatom),whichiswhyscientistshavestruggledforsomanyyearstofindthem.--NewYorkTimes.
简介:Ayou'remaybetthepointwhenwasthelasttimeyoureadabook,orasubstantialmagazinearticle?DoyoureverydayreadinghabitsrevolvearoundFaeebookupdatesortweets?2incaseoneofinnumerableindividualswhodon'tmakeahabitofreadingconsistently,youpassingupagreatopportunity:readinghasanoteworthynumberofadvantages.
简介:《现汉》(第6版)中反映藏族社会、生活等方面的词语在收词范围及释义方面存在一定瑕疵,表现为收词有些随意而释义有些简单或哆唆。在今后的词典修订中注意收词的系统性及严密性。此外,释义言简意赅。
简介:摘要中介语石化现象一直是二语习得研究的一个重点和热点话题。本文主要探讨中介语石化的界定,分类,原因以及近10年发展过程。文章最后对中介语石化现象发展进行总结,并提出一些不足,以及对我国外语教学的启示。