Borman and Lovell proved that humans could survive in space for the time needed to get to the moon and back.

VOA: special.2009.07.01

And, now let's go back to, whoops, I'm running out of space.

再看回来，很高兴啊。

麻省理工公开课 - 固态化学导论课程节选

So, if you can flip your lecture notes over and just write on the blank space, we're going to cover electronegativity first here, and specifically, you can go back and fill this in to your lecture 9 notes, if you want to stay organized, but I just suggest just writing it on lecture 10 notes now and going back.

因此，请大家把讲义翻到背面,就在空白处做一下笔记，我们要先讲一讲电负性，特别提醒一下，大家可以,回到第九课的讲义并把这些记在那里，如果你想保持条理性的话,但是我建议大家先写在第十课的讲义上,回去再记到第九课的讲义上。

麻省理工公开课 - 化学原理课程节选

Back on Earth, space scientists and engineers worked around the clock to design and test new ideas to help the astronauts survive.

VOA: special.2009.07.22

Scientists at the Goddard Space Flight Center in Greenbelt,Maryland, found the substance glycine in material brought back to Earth from a comet.

VOA: special.2009.09.30

At space agency headquarters, doctors studied his medical condition as the information was being sent back to Earth.

VOA: special.2009.06.24

The story of how space scientists were able to recover the material and bring it back to Earth is just as exciting.

VOA: special.2009.09.30

Today,VOA broadcasts to satellites in space that send the signal back to stations on the ground that transmit programs with a clear signal.

VOA: special.2010.12.08

Arctic sea ice is important because it throws sunlight back into space, keeping the sea cold.

VOA: special.2009.05.05

They had proved that people could live and work in space for the time it would take to get to the moon and back.

VOA: special.2009.06.24

The other three parts move forward and back through time and space.

VOA: special.2010.01.10