We observed a curious phenomenon that day.

那天我们发现了一个奇怪的现象。

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A curious phenomenon. We'll have to research this more.

一个有趣的现象，我们会更深入的探讨。

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What their study does explain is the long-known but curious phenomenon that apparently similar parts of the body suffer different rates of cancer.

他们的研究解释了人们早已知道但很好奇的一个现象：明显相似的身体部位癌症的发病率却不同。

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This was one of the curious ironies of the whole Bin Laden phenomenon.

BBC: Meeting Khaled al-Fawwaz - Bin Laden's man in London