求翻译：面对媒体之间日益激烈的竞争，都市频道不断实现自我突破，几乎每年都推出一档新的自制栏目，根据市场需求对节目进行优胜劣汰。是什么意思？

Facing the increasingly fierce competition between media, Metropolitan channels constantly realize breakthrough almost every year to launch a new homemade columns, according to market demand for programme excellence.