后来人们发现这种结构非常有效，交通工程师着手间这项技术用于高速公路。
Once people realized how well it worked, transportation engineers began applying the same techniques to highways.
但是，后来人们发现，实际上是大量的日本家庭主妇在做这件事情，而要想制止家庭主妇做套利交易，难度非常大。
But people found afterwards that, actually a mass of Japanese house wives were doing this, while it's very hard to stop house wives to do this.
但是，后来人们发现，实际上是大量的日本家庭主妇在做这件事情，而要想制止家庭主妇做套利交易，难度非常大。
Later, people found out that in fact it was Japanese housewives who were behind this, and it was extremely difficult to prevent them from Carry Trade.
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