Ravi says the air is still unbreathable.

拉维说空气仍然无法呼吸。

One by one, the astronauts emerge  from their Starships and walk with light, bounding steps across the planet's surface, protected  by spacesuits from the extreme temperatures and unbreathable atmosphere.

宇航员们一一从他们星际飞船来， 在空服下，轻快地行在地球表面，免受极端温度和难以呼吸大气影响。

Some were probably put off by practical challenges such as clogged roads, unbreathable air and patchy telecoms networks.

一些人可能因为实际问题而却步，比如拥堵道路、无法呼吸空气和不稳定电信网络。