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be at a loss as to the why and wherefore of; be quite at sea as to; not know why it is so (/what to make of/what is up)❍ 他们在这个问题上搞神秘化，弄得人人～。They made a mystery of that problem. As a result,nobody knows why.
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。