A dirt road or track is made from hard earth. A dirt floor is made from earth without any cement, stone, or wood laid on it.
I drove along the dirt road.
我行驶在一条土路上。
If there is dirt on something, there is dust, mud, or a stain on it.
grime
I started to scrub off the dirt.
我开始擦除灰尘。
You can refer to the earth on the ground as dirt, especially when it is dusty.
They all sit on the dirt in the dappled shade of a tree.
他们都坐在斑驳树荫下的地上。
If you say that you have the dirt on someone, you mean that you have information that could harm their reputation or career.
a sleazy reporter assigned to dig up dirt on Jack.
一名低级庸俗的、受人指使去挖掘关于杰克的流言蜚语的记者。
treat someone like dirt
If you say that someone treats you like dirt, you are angry with them because you think that they treat you unfairly and with no respect.
People think they can treat me like dirt!
人们竟然认为可以把我完全不当一回事!