原文：You are permitted to try to attract attention, but there are

原文：You are permitted to try to attract attention, but there are rules about how to do this.
译文：你可以引起（酒保）的注意，但没有规可循。
【正确答案】：
改译：你可以设法引起（酒保）的注意，但这是有规可循的。