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【填空答案】
1. pristine adj. 原始的，古时的；纯朴的
2.meteoroidsn. 流星体（meteoroid的复数）；
3.streaks n. 条痕；直横条（streak的复数）
4.debris n. 碎片，残骸
5．orbitn. 轨道；vt. 绕…轨道而行vi. 盘旋；绕轨道运行
【听力原文】
S: This doesn’t have anything to do with the lecture, Dr. Brown. It's just
something I was wondering about.
T: I'm always glad to entertain questions.
S: What I want to know is, with all our space exploration, aren't astronomers
concerned that were polluting space, you know with spacecrafts and satellites?
T: That is an interesting question. Well, first of all, it's important to understand
the space isn’t that pristine as you might think. More than 1000 tons of debris
enters the earth's atmosphere every single day.
S: What? The spacecrafts don't need that much garbage?
T: No, but there are meteoroids entering our atmosphere almost constantly.
You are familiar with what the moon's surface looks like, right?
S: But we don't have these craters on earth. I don't understand.
T: Remember the moon's lack of atmosphere means that even small
meteoroids make craters. But most of the meteoroids that hit the earth's
atmosphere melt or break up in the air.
S: Causing meteorite? The streaks of light we see is that meteoroids breaking
up, isn't it?
T: Yes, and getting back to your question about pollution, that's one way we
could deal with the debris of satellites and spacecraft. The truth is we do have
a lot of orbiting debris, and traveling at 10 to 20 thousand miles per hour.
S: Really? I wouldn't want to collide with anything going that fast.
T: It's a real danger for spacecraft. But we could dispose the debris by simply
sending it back into the earth's atmosphere.
S: oh, so the debris was just burned up. Well, thanks a lot, Dr. Brown.
