what's that supposed to mean?
what's that supposed to mean?
 
请问这里 what's 是what is suppose 是动词,这里是被动语态吗?
2.具体supposed在句子中怎么翻译?
另一个问题：Wheels leave grooves in dirt （roads）.roads 为什么是复数？
wheels复数说明轮胎不止一个，grooves复数说明有很多凹痕，但说话者应该是对着一条路说的吧，为什么roads 是复数呢？用road