A neighbour called police after hearing rhythmic tapping on her ceiling - his SOS for help.
楼下的一名邻居听到自己天花板上出现有节奏的敲打声时报了警，这是他的求救信号。
Objective: To determine the dynamic characters of bite force changing in rhythmic tapping and opening-closing with maximal force in loosen teeth.
目的：研究紧咬、叩齿运动中松动牙牙合力的动态变化特征。
There came a tapping noise ahead, regular and rhythmic, like the noise of a sentry, in metal boots, pacing.
前面发出一连串也规则节奏的敲击声，像是岗哨穿着金属鞋子走路的声音。
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