Did the air reach the people of that planet in time to save them?

VOA: special.2010.07.31

It goes up, stays in the air for a very long time, but it falls on your head.

它先上升 在空中停留很长时间,但是它会直接落在头上

耶鲁公开课 - 基础物理课程节选

You see how long you are in the air and the whole time you are in the air, you are traveling horizontally at this speed.

你可以知道在空中停留的时间,当你在空中运动的时候,你一直以这个水平速度在运动

耶鲁公开课 - 基础物理课程节选

"Our study showed for the first time a clear difference between oxygen and air in the treatment of acute cluster headache.

VOA: standard.2009.12.17

This says, if you want to be in the air for a long time, so you may think that 90 degrees is the best angle.

也就是说,如果你想在空中停留更久,你也许会认为 90°是最佳选择

耶鲁公开课 - 基础物理课程节选

NATO,meanwhile,has acknowledged for the first time that Afghan civilians were killed in last week's controversial air strike in Kunduz province.

VOA: standard.2009.09.08

The Paris Air Show ends Sunday which still gives Boeing time to catch up to rival Airbus in securing new aircraft orders.

VOA: standard.2009.06.16

The president will waste no time in Japan, getting to work almost immediately after Air Force One touches down at a Tokyo airport.

VOA: standard.2009.11.12