How nuxt.js nested routes are merged into one route

A home page that needs to distinguish between multiple countries
the current directory is like this

clipboard.png

index_countrytName
index

_countryName.vue

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the route country in this place can be empty.
what"s the difference?

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b31c04-2b60f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b31c04-2b60f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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