It's about getting a spacecraft that's hurtling through deep space and using all this bag of tricks to somehow figure out how to get it down to the surface of Mars at zero miles an hour.
就是一个航天器飞速冲入外太空 然后用一套措施设法减速为零降落在火星表面。 然后用一套措施设法减速为零降落在火星表面。