A theoretical understanding of the dynamics of flight was first defined in print by Sir George Cayley in 1809, the same year he built and flew a heavier-than-air model.

一個理論的認識嗯啊视频在线播放网页，動態(tài)飛行首次界定的打印由主席先生喬治的Cayley在1809年免费人在线黄色网站观看，同年他建立了飛往加重了比空氣模型天天爽天天透天天片a久久网。

The remarkable series of experimental "Aerodromes" of Samuel Langley and the impressive machine of Wilhelm Kress stand as two of the most promising of the pre-Wright attempts at heavier-than-air flight.

顯著一系列的實驗&機場&塞繆爾朗利和令人印象深刻的機威廉kress的立場97人人操日日干，作為兩個最有前途的前賴特企圖加重比空氣飛行免费射黄视频。

The whole pattern of heavier-than-air construction are all precisely similar.

比空氣重的建筑物的模式驚人的相似

That any of his heavier-than-air powered machines flew is.

任何他加重比空氣動力機器飛抵是。

"Heavier-than-air flying machines are impossible."

&重于空氣的飛行器是不可能的性爱777。&

heavier-than-air：比空氣重的

heavier 沉重的 | heavier-than-air 比空氣重的 | heaviest 重的

heavier-than-air aircraft：重於空氣航空器

heat wave 熱波 | heavier-than-air aircraft 重於空氣航空器 | Heaviside layer 海氏層

heavier-than-air aircraft：重航空器

765 Heat Treatment 熱處理 | 766 Heavier-Than-Air Aircraft 重航空器 | 767 Height 實際高度

heavier-than-air aircraft：重飛行器

heating wire || 電熱絲 | heavier-than-air aircraft || 重飛行器 | heavily tapered solid || 整體模蕊盒

aircraft; heavier-than-air：重於空氣航空器

aircraft hazard 飛機危險事件 | aircraft; heavier-than-air 重於空氣航空器 | aircraft; high-wing 上單翼飛機