Just like a child asking his father for something not because he needs it, the reason why the child asks for it may be because he saw his friends having it, and that is why he wants it too.
就如同一个小孩可能会他的父亲哀求一件物品,但这物品却不是他所需要用到的,甚至有可能他向他父亲哀求的原因,是因为他的朋友都拥有这物品,所以他也想要有这件物品。