Balloon loop
01
气球环线, 回旋铁道
a circular railway track that allows trains to change direction without needing to turn around
例子
The train traveled along the balloon loop to return to the station after dropping off passengers.
火车沿着气球环线行驶，在下车后将乘客送回车站。
Engineers designed the balloon loop to efficiently manage train traffic at the busy junction.
工程师设计了气球环，以有效管理繁忙路口的火车交通。
