steering axle quadrangle

例句：

1. 1. The car's steering axle is the most important part ofthe vehicle.
   汽车的转向轴是车辆最重要的部分。
2. 2. The engineer carefully checked the steering axle before starting the engine.
   工程师在启动发动机之前仔细检查了转向轴。
3. 3. Thequadrangle was designed to provide aunique view of the city skyline.
   这个四角形是为了提供独特的城市天际线视图而设计的。