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市场上红了相当一段时间的家庭健身器近来已经风光不再。不少出售健身器的商场过去一天总要卖出几件。如今一星期也难有几个主顾．价格偏高，是健身器销售下滑的主要原因。种类繁多的健身器，毕竟不是精密器械，其生产加工技术工艺也相对简单其才绝大多数器械的材质并非用什么?
The home fitness equipment that has been on the market for quite a while has recently lost its popularity. Many shopping malls that sell exercise machines always sell several pieces in the past day. It’s hard to have a few customers in a week now. The high price is the main reason for the decline in fitness equipment sales. A wide variety of fitness equipment is not a precision device after all. Its production and processing technology is relatively simple. What is the material of most devices?