求翻译：　　一淘网分析师称，电器网购市场竞争激烈，而增长幅度趋稳，是各大网站争相扩充品类的重要原因。“电器类商品平均单价较高，虽然交易额高但覆盖用户数有限，对网站快速扩大用户基数效果有限。”是什么意思？

An Amoy Network analyst, said electrical online shopping market is highly competitive, while the growth rate stabilized, the major sites competing to expand the category of the important reasons. Higher average unit price of electrical goods, although the high volume of transactions but coverage lim