「next before」係點解呢？

這句的sentence一點沒有問題，而這句的period是指「期間」
而這句的next before的next，在這裏不作”下一個”解，而是作”貼近”解，所以next before就是指著”緊貼ｘｘ之前”
而你整句可譯作”緊貼在行動在之前的期間”
next before的例子：
But wherever we are in the Communion, this Sunday is the last in the church's year. Whether it's called the Sunday of Christ the King, the last Sunday after Pentecost, or the Sunday Next Before Advent, this day stands as the end of one year and the gate of another. Advent is just over there; a hushed, solemn, waiting season, clad in dark Sarum blue or deep royal purple. A short sharp significant season whispering: 'Not long now! But not yet'.

The periods must be 'next before' the action.
期間必須是'' 其次以前 ''行動。