I can't follow what you said.
I can't understand the meaning of your saying.
I can't understand what you are saying.
都可以，看你喜欢哪种表达方式了！
最简单的说法就是I can't follow you.
I don't know what you said!!
还可以用I can't catch up with you
地道表达：
I can't catch what you meant.
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