To give an example, there used to be a well-known noodle establishment in Tainan selling Tainan danzai noodles. After being in business for over a century, its clientele was still limited to Tainan-the range over which its knowledge was applied didn't extend beyond Tainan itself.
舉一個例子，以前某甲在台南賣擔仔麵，很有名，但賣了一百年，還是只在台南賣，他的知識應用的範圍就在台南而已。