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If it's cold and dense,
若空氣寒冷稠密
you slow down faster,
減速會更快
you end up shorter.
降落軌道就較短
If it's hot and low density,
若空氣炎熱稀薄
you end up flying farther.
那就會飛得更遠
The dangers of this unpredictable atmosphere
大氣不可預知
are heightened by the speed the spacecraft
而航天器駛向火星的速度極高
has to travel at to get to Mars.
這使著陸更加危險
It will arrive
抵達火星時
at 13,000 miles per hour.
航天器的速度高達每秒5.8公里
We have enough energy
航天器高速飛行
of motion in the spacecraft
具有極高的動能
that we could vaporise the spacecraft in the atmosphere of Mars
使得只要它進入火星 與大氣摩擦
just by slamming into that atmosphere
產生的巨大熱量
and developing so much friction that the vehicle would burn up.
就足以將航天器汽化并燒毀火星車
So it's a challenge.
所以這是一個挑戰
The rover will be tucked inside a spacecraft
當進入危險的火星大氣層時
when it reaches the dangerous Martian atmosphere.
火星車將藏在航天器內部
Its first line of defence
它的第一道防線
will be the world's biggest heat shield.
是世界上最大的防熱罩
Next, the team have to stop it
接下來 還要讓它減速
from crashing head-on into the Red Planet.
以防火星車一頭撞上地面
So they have designed
所以他們設計了
the biggest supersonic parachute ever made.
一張有史以來最大的超音速降落傘
重點解釋：
1.slow down 減速
例句：You must slow down your car.你必須把車子開慢。
2.end up 結束
例句：If he carries on driving like that, he'll end up dead.他照這樣開車,早晚得死于非命。
3.burn up 燒起來； 燒盡
例句：All the wood has been burnt up.木柴全部燒光了。
