A method and system for testing the speech intelligibility of a child comprises providing a set of target sounds as words in the presence and absence of competing sound of a variety of types so as to enable an analysis of the aspects of competing sounds and their respective effects on the speech intelligibility of a child. The method inputs the pre-impact swing properties of a golfer, a plurality of mass properties of a first golf club, and a plurality of mass properties of a first golf ball into a rigid body code. The mobile network therefore implements end-to-end data communication with guaranteed QoS. A feeding point extends from the antenna signal radiating plate in a direction toward the grounding metal plate and corresponds to the extended grounding plane with a predetermined gap therebetween. The support plate together with the retaining clip can be adapted to receive at least one data storage device. With the method above, the time required for aging is significantly shortened, and the aging with high efficiency in electric power is realized.