英语语法分析

"First and foremost, this is a big surprise because we thought we know a lot about this region, the edge of the heliosphere," McComas says.

“首先，这太让人吃惊了，因为我们认为对日球层的边缘已经了解的够多的了，”麦科马斯说道。

Many astronomers think that the limit of the heliosphere, known as the heliopause, is about 9 billion miles (15 billion kilometers) from the sun.

许多天文学家认为，日球层的边界是太阳风顶层，距离太阳90亿英里(150亿公里)。

The two spacecraft are the most distant human-made objects, out at the edge of the heliosphere — the bubble the sun creates around the solar system.

这两艘飞船是目前距离最遥远的人造物体，远在日光层外缘——由太阳产生的，环绕太阳系的巨型泡状体。