unidirectional bus

例句：

1. 1. The traffic flow is unidirectional, with cars moving in one direction only.
   交通流量是单向的，汽车只能朝一个方向行驶。
2. 2.The company's decision was unilateral, without consulting the other party.
   公司的决策是单方面的，没有征求对方的意见。
3. 3.The project has a unidirectional impact on the environment, which is not sustainable.
   该项目对环境的影响是单向的，是不可持续的。