dirt中ir发/ɜː/音，发音相同的有:

shirt、 hurt、her 、nurse...

I started to scrub off the dirt.

我开始擦除灰尘。

His clothes were covered in dirt.

他的衣服沾满了污垢。

He brushed the dirt off his jacket.

他拂掉衣服上的灰尘。

Dirt from the motorway made him cough.

公路上的灰尘使他咳嗽起来。

The road petered out into a dirt track.

大道延伸到一条泥土小径。