【托福聽力零基礎怎么練 托福聽力打基礎聽寫方法指點】1.pick up 撿起;接載
例句:He picked his cap up from the floor and stuck it back on his head.
他從地板上拾起帽子，重新戴在頭上 。
2.afraid of 害怕
例句:He was afraid of hurting my feelings.
他怕傷了我的心 。
3.start to 開始
例句:I'll start to think about it when I have to write my report.
我要寫報告時會對此予以考慮的 。
4.talk about 談論
例句:I had a long talk about this with my best friend.
我和我最好的朋友就此事進行了長談 。
2020托福聽力練習：黑洞碰撞合并對引力波影響
The news last month that gravitational waves had been discovered made waves throughout the world of science.
The finding, from the Laser Interferometer Gravitational-Wave Observatory, or LIGO, showed that extreme gravity can cause ripples in spacetime.
In the case studied, the extreme gravity came from two colliding black holes.
Now one scientist is suggesting an added wrinkle—that those two black holes might have originated in a single star.
“The situation is similar to a pregnant woman that has twin babies in her belly.”
Avi Loeb of the Harvard-Smithsonian Center for Astrophysics.
He's proposing the idea in a paper that's been accepted for publication in the Astrophysical Journal Letters.
Loeb became suspicious because just 0.4 seconds after LIGO spotted the gravitational waves, a space telescope called Fermi glimpsed a bright flash of gamma-ray light in the same area of the sky.
“Detecting such a signal is quite surprising from a collision of two black holes.
What could be the source of a flash of light following a black hole merger?”
Colliding black holes should not produce such light—but the death of a very massive star could.
“My idea was that if the star is spinning very rapidly to start with, then as its core collapses it produces a bar that breaks into two clumps of matter, sort of like a dumbbell configuration. And these two clumps of matter orbit a common center, and they eventually collapse independently into two black holes.”
Of course, it's possible that the Fermi telescope signal was a false alarm.
So we'll see if future gravitational wave detections are also accompanied by flashes of light—supporting the idea that twin black holes collided upon the collapse of a massive star.
上個月人類首次直接探測到引力波的新聞在科學界激起了波瀾 。
這一在激光干涉引力波天文臺(LIGO)上的重大發現,表明極限重力可以引發時空漣漪 。
在這項研究中,這種極限重力來自兩個黑洞的碰撞 。
美國宇航局費米太空望遠鏡在引力波信號之后大約0.4秒檢測到伽瑪射線爆發.jpg
而現在一位科學家提出一種特別的理論，那就是這兩個黑洞可能起源于同一顆恒星 。

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