纪录片《火星任务》 第18期 火星自转

Once it arrives at Mars,

当火星车到达火星时

the whole mass of the planet will stand in the way.

火星本身就会阻碍通信

Mars itself rotates as the Earth rotates,

火星也会和地球一样自转

and so sometimes, even if we wanted to talk to Curiosity,

某些时刻 尽管我们想与好奇号联系

we couldn't.

我们也不能

Because we just have the whole planet between us and Curiosity.

因为整个行星挡我们和好奇号之间

A Martian day lasts 24 hours and 40 minutes.

火星一日有24小时40分钟

For half of that time,

其中一半时间

the rover will drop behind the red planet's horizon,

火星车将处在火星地平线之下

out of view of Earth's antennas¹.

远离地球天线的接收范围

When Curiosity arrives,

当好奇号抵达时

night will be falling on Mars.

降落点正好迎来夜晚

Midway through its perilous² landing procedure,

在十分危险的着陆过程中

the team will lose direct contact with the spacecraft.

控制团队将失去与航天器的直接联系

But NASA can rely on help

但是美国宇航局可以依靠

from some previous Mars missions.

以往的火星任务来提供帮助

1 antennas   

[生] 触角，触须（antenna的复数形式）

参考例句：

• Marconi tied several antennas to kites. 马可尼在风筝上系了几根天线。 来自超越目标英语 第3册
• Radio astronomy today is armed with the largest antennas in the world. 射电天文学拥有世界上最大的天线。

2 perilous   

adj.危险的，冒险的

参考例句：

• The journey through the jungle was perilous.穿过丛林的旅行充满了危险。
• We have been carried in safety through a perilous crisis.历经一连串危机，我们如今已安然无恙。