Generally speaking, if "Yi" can be capitalized, such as age, year and year, we all read it. 177 1 year can be written as 177 1 year, 6 1 year can be written as "6 1 year" and 2 1 century can be written as ". We all read "Yi" when we study. If someone reads Yao, we will be very touched.

If the numbers with "1" are one of the ordered numbers, they are a whole and have their own mathematical meanings, we also read "Yi", such as month, age, number of floors, number of bus lines and so on. None of us described bus 1 1 as Yaoyao, and no one described building 1 as Yaoyao, because they were arranged in a certain order, not arbitrarily. For some telephone numbers, area codes, postal codes, etc. We habitually pronounce "Yao" instead of "Yi" because they have no mathematical meaning, such as "037 1" and "0 10", which are not numbers in the mathematical sense at all, but just a combination of several numbers. We can say that 7 1 is older than 6 1, but we cannot compare "037 1" with "0372". We cannot say that the former is older than the latter. In fact, we read "1" in the phone number as "Yao" for fear of confusion, but we didn't confuse 1 with 7 ourselves, just for fear that others would confuse it when listening, causing unnecessary trouble.

Because the pronunciation of "Yao" is heavier than "Yi", we study the former in order to emphasize or highlight its importance when reading some numbers with special significance that everyone agrees with. Such as "1 10", "1 19", "2 1 1" and so on. You can try. If "1 10" is read as "Yi"

The seriousness and solemnity of Yiling will be greatly reduced.

There are also some differences when reading some events marked with dates. The pronunciation of "Yao" has only been used frequently in recent years, so we all read "Yi" and read "9. 18+05" for some earlier events, such as "9* 18 event" and "1 * 29 movement".