On the subway you can often see children asking their mother or father a question over and over again without receiving a response.
常在捷運車上看到，孩子問一個問題可以重複十次以上，而媽媽毫無回應！看一個小小的孩子不斷地問父母或許認為無謂的問題，最後只好自言自語，真是令人沮喪。