| 单词 | useful lift |
| 释义 | > as lemmasuseful lift useful lift n. chiefly Aeronautics the proportion of the lift (lift n.2 5e(a)) acting on an aircraft or other flying body which exceeds the weight of that body and so causes it to rise. ΚΠ 1917 C. C. Turner Aircraft of To-day xx. 280 The limit of aeroplane possibilities at present in view is summed up in a useful lift of about five tons. 1928 C. F. S. Gamble Story N. Sea Air Station 10 She was warped into her shed for some alterations because she was found to be deficient in ‘useful’ lift. 1997 BioScience 47 223 (caption) At higher speeds, the bird can use the tail to generate useful lift (e.g., during a turn), but this increases drag. 2007 New Scientist 8 Sept. 41/2 100 kilometres up..aeroplanes don't work any more, because they would have to travel so fast to get useful lift from the tenuous atmosphere that they would effectively orbit the Earth. < as lemmas |
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