trolley head

例句：

1. 1. The trolley head was designed to be easily adjustablefor different heights.
   这个手推车头部设计得可以很容易调整高度。
2. 2. The trolley head is where the wheels attach tothe carriage.
   手推车头部是车轮连接到车厢的地方。
3. 3. The trolley head was acrucial part of the design, ensuring stabilityand safety.
   手推车头部是设计中至关重要的部分，确保稳定性和安全性。