For example, the word " room" has two vowel letters: o and o.
例如," room房间" 这个单词有两个元音o和o。
高级每日语法(音频版)
Although there are two vowel letters, o and o, there is only one vowel sound -oo.
虽然有两个元音字母,o 和 o,但只有一个元音-oo。
英语百科
Owned-and-operated station
In the broadcasting industry, an owned-and-operated station (frequently abbreviated as O&O) usually refers to a television or radio station that is owned by the network with which it is associated. This distinguishes such a station from an affiliate, whose ownership lies elsewhere other than the network it is linked to.