简介:<正>一、病句举隅有这样一个句子:"艺人在旧社会,时刻如履冰渊,动辄得咎。"显然,作者的中心意思是要表达艺人在旧社会朝不保夕的苦难生活,用了"如履冰渊"这个成语来作比喻。但"如履冰渊"只是人的一种精神状态,而不是具体的坎坷遭际,读来就觉得虚了些,缺少一种打动人的力量。接下去,"动辄得咎"则很实。前有"时刻"的状语,后有"动辄得咎"的谓语,"如愎冰渊"夹在当中,就特别显得不协调。如果改成"艺人在旧社会,时刻
简介:【原文】Butlet'sstepbackforasecondhereandexplainwhatgravitationalwavesactuallyare.AccordingtoEinstein'stheory,thefabricofspace-timecanbecomecurvedbyanythingmassiveintheUniverse.Whencataclysmiceventshappen,suchasblackholesmergingorstarsex-ploding,thesecurvescanrippleoutelsewhereasgravitationalwaves,justlikeifsomeonehaddroppedastoneinapond.BythetimethoseripplesgettousonEarth,they'retiny(aroundabillionthofthediam-eterofanatom),whichiswhyscientistshavestruggledforsomanyyearstofindthem.--NewYorkTimes.