Examples
wǒ我shù nián数年lái来dōu都hé和zhè这jiā家shāng diàn商店zuò shēng yì做生意。
我数年来都和这家商店做生意。
I've dealt with this store for years.
这是我数年的习惯了，在家里除了吃饭以外我很少离开我的桌子。
For several years I've been in the habit of, when I'm at home, only leaving my desk when it's time to eat.