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In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.对此他竟然没有丝毫的犹豫。籌備一年的電視劇《鑑識英雄II正義之戰》將在2016年5月下旬開拍。《鑑識英雄II正義之戰》除了著重第1季的特色以鑑識科學偵辦刑案，同時加重在辦案過程中追捕嫌犯的武打場面，并将和鑑識專家、知名法醫、檢察署、消防局等机构加强合作。接受自己毫无经验领域的委托的凛花和事务所的牛岛以及后辈小兰，尽管再迷茫他们也合力直面挫折，共同帮助有困难的委托人。Private Vector < Observer > vector = new Vector < Observer > ();在深界四层被蛋毒折磨的理子。救了理子的是最终的纳粹。三人将纳纳粹加入同伴，向邦德等待的深界五层推进冒险。于是，遇到了一个自称是普鲁什卡的女孩，被邦德抚养长大，不知道外界。Q: In your opinion, is it important to understand domain expertise when solving data science problems?