南美海岸上巨砾的奇怪出现令达尔文困惑不已。
Charles Darwin was puzzled by the odd arrangement of boulders on the South American coast.
但是网络上散布的过多建议让品牌营销者困惑不已。
But with the plethora of advice being dispensed on the Web it is no wonder brand marketers are confused.
有种习俗令科学家困惑不已：食土（吃泥土）的习惯。
There’s a habit that’s had scientists puzzled: the practice of geophagy—eating dirt.
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