我们来看一段相关的英文报道
The new legislation caps the amount of milk formula individuals can take out of the city per trip at two tins,which makes it more expensive for parallel traders to operate, as they'll have to make more frequent trips.
Since last September, some 2,000 people trying to cross into Hong Kong from mainland China have been turned away on suspicion of being parallel traders. Nearly 100 parallel traders, mostly mainland Chinese, have also been sentenced to prison stints of up to two months since last fall.
新修订条款规定个人每次行程能够带出香港的奶粉数量限制在两罐，这样的举措令水货商人的经营成本更高，因为他们将不得不更频繁地进出香港。
去年9月以来，约2,000人被怀疑是水货商人，在试图从内地进入香港时被拒绝入境。去年秋天以来，近100名水货商人（大多为内地人）被判刑，刑期最长为两个月。
【讲解】
文中的“parallel trader”是水客或者水货商人的意思，主要是指经常在大陆、香港、澳门之间往来并随身携带着产品的人，他们少则带上几罐奶粉，多则整车整船，价值达数亿元的走私过关。类似的表达还有smuggler 走私者 ，smuggled goods走私货物，contraband 违禁品。