2015-03-27 BBC:星光七纪元-20
时间：2019-01-23 作者：英语课 分类：探索与发现2015年
Actually, Arcturus is an omen 1 of something far worse than the bad weather, a portended 2 drama more intense than any of what you could imagine. When our own sun eventually becomes a red giant in 5 billion years time, it will turn into a destroyer rather than a protector of worlds. Doctor Robin 3 Catchpole, has devoted 4 his middle years to studying these devouring 5 beast of the light. Their story starts the day the hydrogen in their core runs out. Most of the stars’ life, it spins fusing hydrogen into helium. And this of course provides the pressure that resists the force of gravity. When the hydrogen runs out in the core we just got the helium. Then there is no source of energy, so the core starts to collapse 6. And as it collapses 7 under the force of gravity, it heats up. And the temperature becomes high enough to start nuclear fusion 8 reactions in the shell around the core. So we have what we call shell hydrogen burning. Fusion has stopped in the core. It's still hot, but it's dead. The star is now fundamentally different form our twinkling sun. The light we have seen is still being generated by nuclear fusion, but it's happening in a ring of hydrogen that surrounds the core instead.
- The superstitious regard it as a bad omen.迷信的人认为那是一种恶兆。
- Could this at last be a good omen for peace?这是否终于可以视作和平的吉兆了？
- It portended that there was one stone face too many, up at the chateau. 这说明庄园里多出了一张石雕人面。 来自英汉文学 - 双城记
- She confusedly realised this reversal of her attitudes, but could not make out what it portended. 她糊里糊涂的意识到自己这种相反的态度，但是不知道它会带来什么。 来自辞典例句
- The robin is the messenger of spring.知更鸟是报春的使者。
- We knew spring was coming as we had seen a robin.我们看见了一只知更鸟，知道春天要到了。
- He devoted his life to the educational cause of the motherland.他为祖国的教育事业贡献了一生。
- We devoted a lengthy and full discussion to this topic.我们对这个题目进行了长时间的充分讨论。
- The hungry boy was devouring his dinner. 那饥饿的孩子狼吞虎咽地吃饭。
- He is devouring novel after novel. 他一味贪看小说。
- The country's economy is on the verge of collapse.国家的经济已到了崩溃的边缘。
- The engineer made a complete diagnosis of the bridge's collapse.工程师对桥的倒塌做了一次彻底的调查分析。
- This bridge table collapses. 这张桥牌桌子能折叠。
- Once Russia collapses, the last chance to stop Hitler will be gone. 一旦俄国垮台，抑止希特勒的最后机会就没有了。