它除了有现有的单簧两端连接把手的臂力器的使用功能外，也能做屈肘、收胸的运动。
The four-spring rectangle chest-expander has the function of the existing chest-expander with single spring ends connecting handles, and besides, has the functions of bending elbows and drawing chest.
“ 臂力”是三个扁平的压电启动器-当电流通过它时金属板弯曲。
Its "muscles" are three flat-plate piezoelectric actuators — pieces of metal that bend when electricity runs through them.
航模、玩具飞机、玩具汽车、弓背、箭、健身圈、臂力棒、棒球练习器等多种体育用品；
Aeromodelling, aeroplane toys, car toys, arch, arrow, body-building loop, power twister, baseball exercise equipment and other sports goods;
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