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| English | Chinese |
| unidirectional clutch | 超越离合器 |
| unidirectional clutch | 单向离合器联轴器 |
| unidirectional rotor | 单向式制动盘 |
| unidirectional flow scavenging | 二冲程发动机单向流动直流扫气 |
| unidirectional tire | 单导向轮胎 (directional tire) |
| unidirectional tread pattern | 单向胎面花纹 |
| unidirectional type | 不可逆式 |
| unidirectional type | 单向式 |
| unidirectional wheel | 左右不能互换定向车轮 |