It could be two hours a day. It could be seven hours a day.

VOA: special.2009.08.17

If you don't give me seven hours a week, I don't know what I can do for you.

如果你们一周不学习7个小时，我不知道我能为你们做什么了。

麻省理工公开课 - 固态化学导论课程节选

So, I make a pledge. You give me seven hours a week, you will pass this class, not just by the skin of your teeth. You will pass it.

我保证，你们要是一周学习7个小时，肯定可以通过这门课，一点都不惊险，你们会通过的。

麻省理工公开课 - 固态化学导论课程节选

In seventy-seven hours, if all went well, Apollo Eleven would be there.

VOA: special.2009.07.15

Thirteen-year-old Joshua Armah belongs to the Jewish community in Sefwi Wiawso about seven hours from the Ghanaian capital Accra.

VOA: standard.2009.09.26

They chose Andrea. Dr.Fay,operating for seven hours, was able to save Andrea's eyelid, eye muscles and socket.

VOA: standard.2010.06.30

American children now spend an average of seven and a half hours a day watching television or playing with electronic devices.

VOA: special.2010.06.07

Critics of limiting hours say such a requirement could cost American hospitals about one billion seven hundred million dollars a year.

VOA: special.2010.07.13

More than seven hundred fifty thousand tickets sold out within hours of going on sale in March.

VOA: special.2009.06.27

He had flown around the world in seven days, eighteen hours and forty-nine minutes.

VOA: special.2009.03.18

Adults should try to get seven to eight hours of sleep a night.

VOA: special.2010.06.09