训练有素的音乐疗法技师帮助每一位参与者使用打击乐器和鼓即兴创作音乐。
Trained music therapists helped each participant to improvise music using percussion instruments and drums.
涡电流隔离器自从20世纪90年代早期就开始得到使用，它是由长瓶状转鼓内的一个快速旋转磁力转子组成的，转鼓的旋转速度会较慢。
Eddy-current separators, in use since the early 1990s, consist of a rapidly revolving magnetic rotor inside a long, cylindrical drum that rotates at a slower speed.
它采用的是后轮鼓式制动器，而如今除了那些最低级的便宜车，多数车子的标准配备都已经使用盘式制动器了。
It has drum brakes on the rear wheels instead of the more efficient discs that are standard today on nearly every car except the cheapest bargain models.
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