they'd really upset audiences if they strayed away from quite narrow boundaries.
adj. a narrow squeak;a narrow escape：侥幸的脱险；勉强的逃脱
Two police officers had a narrow escape when rioters attacked their vehicle.
It was a narrow victory, by only five votes.
I think you are taking too narrow a view.
It's quite a narrow road.
She had long, narrow feet.
We have moved much closer, narrowed our differences.
Kitty narrowed her eyes and glared at Karen.
The river narrowed and curved sharply to the left.
The gap between the rich and the poor is narrowing.
His eyes narrowed and he pointed at the doorway.