苯丙酮是一重要的有机合成中间体，已有多种方法合成，其中之一是付瑞德尔—克拉夫慈反应。
Propiophenone is a important intermediate in organic synthesis. It has been prepared in some methods. One of them is Friedel-Crafts reaction.
佛瑞德：第一点，那就是方便第二点则是它的成本比较低，你知道只需付网费就够了，网费很便宜。
Fred: Firstly, it is convenient. And secondly, it has low cost, because you know you only need to pay the fee of Internet service.
佛瑞德：第一点，那就是方便第二点则是它的成本比较低，你知道只需付网费就够了，网费很便宜。
Fred: : Firstly, it is convenient. And secondly, it has low cost, because you know you only need to pay the fee of Internet service.
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