新法规对商业广告的播放时间实施了严格限制。

The new regulation imposed a strict ___restriction on the airtime of commercial advertisements.

公园的边界由一排灌木清晰界定。

The ___circumscription of the park is clearly defined by a row of shrubs.

法律文本中对权利的精确界定至关重要。

The precise ___circumscription of rights in legal texts is crucial.