twin travelling crane

例句：

1. 1.The twin travelling cranes are performing a complex maneuver in the sky.
   这对双胞胎起重机正在天空中执行一个复杂的动作。
2. 2. The twin travelling cranes have been used for decades to transport heavy loads across long distances.
   这对双胞胎起重机已经使用了几十年来运输重物跨越长距离。
3. 3. The twin travelling cranes are essential for construction projects that require lifting heavy objects.
   这对双胞胎起重机对于需要举起重物的建设项目来说是必需的。