他的喷气流不需要螺旋桨，而是由一个两端开口的管子来实现。
His jet needed no propellers. It was a tube, open at both ends.
由一根一端封闭的纤细管子组成的高音木管乐器，侧边有按键和指孔，靠近封闭端有一个使气流进入的开口。
A high-pitched woodwind instrument consisting of a slender tube closed at one end with keys and finger holes on the side and an opening near the closed end across which the breath is blown.
由一根一端封闭的纤细管子组成的高音木管乐器，侧边有按键和指孔，靠近封闭端有一个使气流进入的开口。
A high-pitched woodwind instrument consisting of a slender tube closed at one end with keys and finger holes on the side and an opening near the closed end across which the breath is blown.
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