留空时间的英文

• time at pickup altitudes

• 留空:    leave a blank; leave a space ...
• 时间:    time; hour
• 跳起后滞留空中的时间，滞空时间。:    hang time
• 半排空时间:    half-time emptying
• 抽空时间:    evacuated time; evacuation time up to operating pressure; pump-down time

例句与用法

1. For civil purpose . the biggest advantage of the flying air boat is that it can anything that a plane can do but at the cost roughly of one tenth , the time of staying in the air is very long ranging from 24hr . - 72hr . ,
   飞艇最大的优点是凡是飞机能做的事飞艇几乎全能做，但飞行成本比飞机便宜十几倍，留空时间长，一般飞艇空中飞行时间可达24小时- 72小时，以上这些均是大型飞艇。