Noun + 道 / Number + 道 + Noun
道 means "path," "way," or "road," and can refer to both physical routes and abstract methods. In colloquial usage, it also serves as a measure word for questions or dishes. It appears in many compound words and idiomatic expressions.
你知道去火车站的道怎么走吗?
Nǐ zhīdào qù huǒchēzhàn de dào zěnme zǒu ma?
Do you know how to get to the train station?
这道题太难了,我不会做。
Zhè dào tí tài nán le, wǒ bù huì zuò.
This problem is too difficult; I can't solve it.
今天晚餐一共点了六道菜。
Jīntiān wǎncān yígòng diǎn le liù dào cài.
We ordered a total of six dishes for dinner today.