"Three pairs of socks for only two dollars"
这个表达方式来自于商店或广告中的促销语，用来吸引顾客购买商品。
例句：
"Come to our store and get three pairs of socks for only two dollars."
(来我们商店，短袜三双仅售两美元)
"Limited time offer: three pairs of socks for the price of two."
(限时优惠：短袜三双仅售两美元)
"Stock up on socks with our amazing deal: three pairs for two dollars."
(用我们的特价买短袜：三双仅售两美元)