假如我们暂不把苍蝇当作令人厌恶的昆虫,而将它视为一架微型飞行器时,则会发出惊喜的赞叹。它以如此小的半径盘旋,能突然中断风驰电掣般的飞行,会悬空定身,并能倒飞逆行。它在瞬息间起落而无须滑行助跑,偶而还能倒冲下地。 If we do not treat flies as repulsive insects for the time being and treat them as a miniature aircraft, we are amazed at the surprise. It circled with such a small radius that it could suddenly interrupt the maneuvering flight and vacillate itself and fly backwards and retrogrades. It rises and falls in a blink of an eye with no gliding run and, occasionally, a kick-down.