After years of practice, I learned to identify the different helicopters by their sound alone. Early one morning, I was awakened when one buzzed my barracks. I ran through the possibilities, but couldn't identify it. Intrigued by what kind of helicopter it could be, I sprinted to the window just in time to see the single engine, twin-bladed main rotor lawn mower come into view.
經(jīng)過多年的練習(xí),我能夠光聽聲音就說出是哪一種直升機。一天清早,我被低空掠過的轟隆聲吵醒。我把所有的可能性都排查一遍,仍然不能說出這是哪一種直升機。這激起我極大的好奇心,想看看這到底是哪一種。我全速沖到窗口,正好看到一部單引擎雙刀主旋轉(zhuǎn)割草機。