Abstract: this paper points at that the resultant braking force point of drum brake is on the base circle and finds the relation between the structural parameters of shoe block and moment of force.

文摘：该文阐明制动力的合力点在基本圆上，并找出蹄块结构参数与制动力矩之间的关系。

youdao

Most common performance is that the two team lined up in a circle by lifting their drums, and the team wins the game by beating and holding the drum in the air forlonger period of time.

最常见的是龙虎两队排成两排的对赛和围成圈儿的追鼓。 对赛就是将桶鼓举起敲打，没有力气先放下鼓的人就输了。

youdao

That was just one of the challenges faced by the mediators of the drum circle dispute.

FORBES: Mediating the Sound of Drums for Occupy Wall Street

In one scene he musters up enough courage to play in a drum circle in Central Park.

NPR: Learning to Drum �� and Live �� in 'The Visitor'

The Drum Circle and Occupy Wall Street: Drumming, Mediation and the Occupation.

FORBES: The Revolution Will Be Mediated