(it) beats me
informal
something that you say when you cannot understand something.
It beats me how he managed to survive for three weeks alone in the mountains. (often + question word)
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。