我国500米口径球面射电望远镜(FAST)最近有了一个重大的发现
它探测到了距我们30亿光年的神秘无线电信号！
带着Peter老师在今天的学习内容中
重点讲解的两个单词
detect和edge
跟着我们一起去看看
这个神秘无线电信号究竟是什么
......
问
答
他们靠提供低息来招揽客户。
They wooed customers by offering low interest rates.
上期节目回顾
【Amazing China】外卖PK方便面，你会选择哪一个？
请用edge翻译下面的句子
凭借先进的生产技术，他们得以占据竞争优势。
听音频，看文字，学英语
China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) has detected a repeating fast radio burst (FRB) — mysterious radio signals from outer space — for the first time.
中国500米口径球面射电望远镜(FAST)首次探测到来自外太空的重复快速射电暴(FRB)神秘无线电信号。
The FRB originated some three billion light years away from Earth. Interference factors including aircraft and satellites have been eliminated and cross validation is being carried out. FRB is one of the hottest topics in astronomy. It was not until 2007 when the first FRB was discovered by humans. Fewer than 100 FRBs have been detected internationally to date.
FRB起源于离地球30亿光年的地方。包括飞机和卫星在内的干扰因素已经消除，正在进行交叉验证。FRB是天文学中最热门的话题之一。直到2007年人类才发现了第一颗FRB。迄今为止，国际上检测到的frb不足100个。
detected [dɪ'tektɪd]
adj. 检测到的
例：
The doctor can often detect depression from expression, posture, and movement.
善于观察的医生常常能从人的表情、姿势以及动作诊察出抑郁症。
We are trying to detect and understand how the climates change.
我们正努力探寻并理解气候是如何变化的。
burst [bɜːst]
v. 爆炸；戳破；爆裂；（器官或血管）爆裂；装满；充满感情；突然爆发（某种感情）；爆发出；冲开；闯；分页，断纸
n. 爆炸；猝发；迸发；冲刺；一阵短促的射击
light year
光年
There is still no cohesive explanation for the origin of FRB in the international scientific community at present. FRBs mostly only appear once, which makes them very hard to track.
目前国际科学界对FRB的起源还没有一个统一的解释。FRB通常只出现一次，这使得跟踪它们非常困难。
The FRB detected by FAST's real-time detection terminal, however, is one that has been observed before. Known as FRB121102, it was first discovered in 2012 and found to repeat in 2015. Analysis of data later located the source of the signal coming from a dwarf galaxy three billion light years away.
然而，FAST的实时检测终端检测到的FRB是之前观测到的FRB。它被称为FRB121102, 2012年首次被发现，2015年再次被发现。后来对数据的分析确定了信号的来源，该信号来自30亿光年之外的一个矮星系。
The first pulse from FRB121102 was spotted by FAST on Aug 30. After this, the telescope recorded dozens of pulses from the FRB over the course of days. On Sept 3 alone, more than 20 pulses were detected. The number of enigmatic bursts detected so far is too small to draw any conclusions, Zhang said. FAST, the world's largest single-dish radio telescope, has a certain edge in detecting repeated FRBs. This is because the 19-beam receiver installed on FAST, covering frequency ranges of 1.05 - 1.45 GHz, is very sensitive to radio signals, Zhang said.
8月30日，FAST发现了FRB121102的第一个脉冲。在此之后，望远镜记录了数十次来自FRB的脉冲。仅9月3日一天，就检测到20多个脉冲。目前探测到的神秘爆发的数量太少，无法得出任何结论。FAST是世界上最大的单碟形射电望远镜，在探测重复的frb方面有一定的优势。这是因为安装在FAST上的19波束接收器覆盖1.05 - 1.45 GHz的频率范围，对无线电信号非常敏感。
explanation [ˌekspləˈneɪʃn]
n. 说明，解释；辩解
at present
目前，现在
track [træk]
n. 轨道；足迹，踪迹；小道
vt. 追踪；通过；循路而行；用纤拉
vi. 追踪；走；留下足迹
real-time [,rɪəl 'taɪm]
adj. 实时的；接到指示立即执行的
terminal [ˈtɜːmɪnl]
n. 航空站；终点站；终端机；线接头；末端；晚期病人
adj. 晚期的；无可挽回的；末端的；终点的；期末的；（花朵等）顶升的
pulse [pʌls]
n. [电子] 脉冲；脉搏
vt. 使跳动
vi. 跳动，脉跳
edge [edʒ]
n. 边缘；优势；刀刃；锋利
vt. 使锐利；将…开刃；给…加上边
vi. 缓缓移动；侧着移动
例：
They all walked barefoot across the damp sand to the water's edge.
他们全都光着脚走过潮湿的沙地来到水边。
（图片来源于：百度百科）
21：00-21：30
