Yen concludes, "If people still have the same old idea of thirty years that the sewer is a place to dump anything and everything, then you can hire as many top-notch engineers and spend as much money as you like and the system will still be a mess."
他說：「如果大家還是卅年前的觀念，以為排水溝是什麼東西都可以丟的地方，請再好的工程師、花再多的錢做排水系統，也是枉然。」