PK
|scrAuthoriId|booktitle|page|line|position|word
|1           |bookA    |1   |1   |1       |word1
|2           |bookA    |1   |1   |2       |word2
...
|342         |bookB    |234 |3   |11      |word3453

PK                FK1          FK2
|authoriContentsId|scrAuthoriId1|scrAuthoriId2|
|1                |1            |100
|231              |234          |1029

PK                    FK
|translationAuthorIId|authorIContentsId|translation|
|1                   |3                |uvw
|2                   |3                |xyz
|2                   |45               |abc

FK                FK
|authoriContentsId|authoriCommentsId
|1                |3
|4                |3
|231              |45

PK                FK
|authoriCommentsId |comment
|3                 |comment on content 1 and 4
|45                |comment on content 231