In the 1960s and 1970s, most personal and corporate planes were propeller or turbo-prop aircraft, which fly at a lower altitude than jetliners.

在1960和1970年代，大部分个人和企业的飞机是飞行高度低于喷气式飞机的螺旋桨式或涡轮螺旋桨式飞机。

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Kohler attributes the immediate cause of the abandonment to problems with corn production at a high altitude during short growing seasons.

科勒认为，（居住地）废弃的直接原因是高海拔地区的玉米生长季节较短，因此生产出现了问题。

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Your body needs to get used to a high altitude before you climb to an even higher one.

在你爬到更高的地方之前，你的身体需要适应高海拔的环境。

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Ladakh,situated more than 11,000 feet above sea level, is a high altitude desert where rainfall is usually very small.

VOA: standard.2010.08.06

They have remained at a high altitude ever since, notwithstanding a recent dip in the figures.

ECONOMIST: Death and the American

Jones added sensors that, by monitoring the air temperature above and below the heli ten times a second, can keep the chopper at a fixed altitude with more accuracy than a human on the ground can.

FORBES: Eye in the Sky

He said the preceding manoeuvre was probably the highest and most sustained of the day in terms of G-force but said flying at a higher altitude "may not have made a difference".

BBC: Flt Lt Jon Egging