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Pronunciation Guide
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We talked about Roswell earlier and people talk about UFOs, but scientists believe that UFOs are not likely for several reasons.
First of all, it is too far. We talked about how it takes 6 - 7 months to reach Mars even when we travel by 20km/sec. And it takes 9 years to reach Pluto with the same speed.
We live in the solar system and there is the end of it. There is a rocket called Voyager 1, which was launched in 1977 and still travels to wards it.
Listen to native speakers pronounce “20km” in real conversational contexts with synchronized timestamps and subtitles.