VOA慢速英语:美国宇航局寻求商业公司在月球上开采资源

play stop

mute max volume

00:00

00:00

repeat

Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin.

celestial body – n. an object located outside of Earth's atmosphere, such as the moon, stars or other planets

era – n. a long time or period of history

sole – adj. only