It will take the probe about seven months to reach Mars and another several months for the landing and roving to be complete.
Key word 重点词汇:
任务 <名词 n.> task; mission; assignment
E.g. Wǒmen de shǒuyào rènwù shì shōují xìnxī.
我们的首要任务是收集信息。
Our first task is to gather information.
Zhè shì duì huǒxīng de shǒucì zài rén hángtiān rènwù.
这是对火星的首次载人航天任务。
It's the first manned space mission to Mars.