第四条在广告经营活动中，禁止垄断和不正当竞争行为。
ARticle 4. Monopoly and unfair competition shall be prohibited in advertising operations.
户外广告经营活动中，禁止任何形式的垄断及不正当竞争行为。
Any form of monopoly or unfair competition is prohibited in the operation of outdoor advertising business.
在广告经营活动中，禁止垄断和不正当竞争行为。
Monopoly and unfair competition shall be prohibited in advertising operations.
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