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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Sometimes an eagle flies lower than a chicken, but the chicken will never fly as high as the eagle .

鹰有时比鸡飞得还低，但鸡永远不能飞得像鹰那样高。

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Sometimes the eagle flies lower than the chicken, but the chicken can never fly as high as the eagle!

鹰有时飞得比鸡还低，但是鸡永远无法飞得象鹰那么高！

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For travellers who drive more than fly, lower oil prices should also help keep trip costs in check.

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It's difficult to determine height accurately, it was maybe three or four hundred feet, quite a bit lower than helicopters would normally fly at.

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In the United States, people can fly model aircraft without approval from the Federal Aviation Administration if they keep the drone in line of sight, lower than 400 feet above ground and away from airports and air traffic.

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