1. The instructions in the manual were written muddily, making it difficult for me to understand how to use the device.
这本说明书上的指导非常含糊不清，让我很难理解如何使用这个设备。

2. The speaker's presentation was muddily delivered, causing confusion among the audience.
演讲者的演讲传递得很模糊，引起听众的困惑。