| 词汇 | helicopter |
| 词根词缀 | 词源： 1861, from Fr. hélicoptère "device for enabling airplanes to rise perpendicularly," thus "flying machine propelled by screws." The idea was to gain lift from spiral aerofoils, and it didn't work. Used by Jules Verne and the Wright Brothers, the word transferred to helicopters in the modern sense when those were developed, 1920s. From Gk. helix (gen. helikos) "spiral" (see helix) + pteron "wing" (see petition). Nativized in Flemish as wentelwiek "with rotary vanes." Heliport is attested from 1948, with second element abstracted from airport. 词根记忆： n. 直升(飞)机The optional helicopter is adopted to help the optimistic helpless in the hell.可选用的直升飞机被用来帮助地狱里那些乐观的无助者. n. 直升飞机(helic+opt选择螺旋上升→直升飞机)[helic=spiral,表示"螺旋"] 词根词缀： helicopter helicopter n 直升飞机(helic+opt选择螺旋上升=直升飞机) helic=spiral,表示”螺旋” helicopter n 直升飞机(helic+opt选择螺旋上升=直升飞机) helical a 螺旋形的(helic+al) helix n 螺旋线 |
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