The atmosphere of Mars could not support life.(生命無法在火星的大氣環(huán)境下生存。)

Even if bacteria did arrive on Earth from Mars, they must have died out.(即使細(xì)菌真的從火星來到地球，它們也一定已經(jīng)滅絕了。)

China has not launched any space probes to Mars so far.(到目前為止，中國還沒有發(fā)射過任何火星探測器。)

The tiny rocket is attached to the spacecraft and is designed to propel it toward Mars.(微型火箭附在宇宙飛船上，用來推進(jìn)飛船飛向火星。)

We will be able to travel to Mars and back in just three days.(我們將能在三天內(nèi)往返火星。)

People sat impatient and frightened in the dark as if an unseen enemy had landed from Mars.(人們焦急不安、驚惶失措地坐在黑暗中，好像有一名來自火星的看不見的敵人已登上了地球。)

Mars was visible, dead in the centre of the telescope.(火星清晰可辨，正好就在望遠(yuǎn)鏡的中心。)

You can get the real time weather reports for Mars with the iPhone.(你可以用iPhone獲得火星的實(shí)時(shí)天氣報(bào)告。)

Mars and Earth have orbits which change with time.(火星和地球的軌道隨著時(shí)間而發(fā)生改變。)

China's first Mars mission is expected to be carried out by 2020.(中國的首個(gè)火星任務(wù)預(yù)計(jì)將在2020年完成。)