【昨日回顾】
That was just about the moment that the universe was born. What the researchers found was at once both amazing and expected: the US National Aeronautics and Space Administration’s Cosmic Background Explorer satellite—Cobe—had discovered landmark evidence that the universe did in fact begin with the primeval explosion that has become known as the Big Bang (the theory that the universe originated in an explosion from a single mass of energy).
那大约就是宇宙形成的时候。研究人员的发现既令人惊讶，又在人们的意料之中：美国国家航空航天局的Cobe号宇宙背景探测器已经发现了划时代的证据，表明宇宙确实起源于最早的一次爆炸，人们称之为"大爆炸"（此理论认为宇宙起源于一大块能量的爆炸）。
【今日长难句】
The existence of the giant clouds was virtually required for the Big Bang, first put forward in the 1920s, to maintain its reign as the dominant explanation of the cosmos.
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【结构解析】
1. 句子主干为 The existence of the giant clouds /was virtually required for /the Big Bang;
2. first put forward in the 1920s 为the Big Bang 的后置定语；
3. to maintain its reign as the dominant explanation of the cosmos 为动词不定式充当目的状语。
【词的处理】
virtually / ˈvə:tʃuəli / adv. 实际上
put forward 提出
maintain / meinˈtein / linking verb 维持，保持
reign / rein / n. 统治时期，当政期
dominant / ˈdɔminənt / adj. 占支配地位的
cosmos / ˈkɔzmɔs / n. 宇宙
【参考译文】
The existence of the giant clouds was virtually required for the Big Bang, first put forward in the 1920s, to maintain its reign as the dominant explanation of the cosmos.
译文1：巨大的宇宙云的存在，实际上是20年代首创的大爆炸论得以保持其宇宙起源论的主导地位不可缺少的。
译文2：巨大的宇宙云的存在实际上大爆炸理论不可或缺的，大爆炸理论是20世纪20年代首次提出的，目的是保持其宇宙起源论的主导地位。
【明日长难句】
According to the theory, the universe burst into being as a submicroscopic, unimaginably dense knot of pure energy that flew outward in all directions, emitting radiation as it went, condensing into particles and then into atoms of gas. Over billions of years, the gas was compressed by gravity into galaxies, stars, plants and eventually, even humans.
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