['Thus', ',', 'in', 'order', 'to', 'fulfill', 'the', 'localization', 'of', 'Standard', 'Model', 'particles', 'on', 'a', 'brane', 'with', 'positive', 'tension', ',', 'it', 'seems', 'that', 'some', 'additional', 'interactions', 'except', 'the', 'gravitational', 'interaction', 'must', 'be', 'also', 'introduced', 'in', 'the', 'bulk', '.']