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通过加强对学生路队的管理,学校既保障了学生安全,消除了安全隐患,又展示了学校文明形象和学生文明风采,赢得了学生家长的高度赞扬和社会的广泛肯定。然而,对于口语来说,我们的任务不是去认识更多的新单词却不会用,而是要“向回走”,回过头去掌握你认为你已经掌握的旧单词,多做延伸记忆、造句练习,做到信手拈来。

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intertwined

the galaxy

What we discovered is that the supermassive black holes at the center of galaxies and the galaxies themselves are really very tightly intertwined.
The stars at the edge of the galaxy have no physical connection with the black hole. Yet somehow their speed is tightly bound with the size of the black hole billions of miles away. If the two things aren't physically linked now, it means they must have been at some point in the past.
The fact that we see there is such a tight relationship between the speed of the stars and the black hole in the middle is a probe to what happened early on in the galaxy.
It screams at you something that you don't yet understand about the connection between galaxy formation and black hole formation.
The relationship points at an extraordinary idea: that galaxies and their giant black holes could be linked from birth. In fact, scientists thought that supermassive black holes might even be involved in the formation of galaxies themselves.

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