A digital trunked communication system is applied in Guangzhou Metro Line 2. The composition and merit points of the system and the functions of its principal equipment is introduced.

介绍了数字集群系统在广州地铁二号线的应用情况，从系统构成、主要设备功能及优点等方面进行了介绍。

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As to whether these points have merit, the answer, like Mr Obama himself, is complicated.

ECONOMIST: Lexington

In his quest for discovery, he concluded that most every program contains points of merit, but that for most people no single dietary theory will provide every answer.

FORBES: From the Beginning

Instead, priority would shift to a merit-based system with points for things like education and language skills.

NPR: Immigration Plan Puts Price on Visa