direct-driven airscrew

例句：

1. 1.The aircraft uses a direct-driven airscrew to propel itself forward.
   这架飞机使用直接驱动的螺旋桨来推动自己前进。
2. 2.The engineer designed the new engine with a direct-driven airscrew for better efficiency.
   工程师设计了新的发动机，用直接驱动的螺旋桨以提高效率。
3. 3.The helicopter's main rotor is driven by a direct-driven airscrew, which allows it to fly at high altitudes.
   直升机的主旋翼由直接驱动的螺旋桨驱动，这使得它能够在高海拔飞行。