Even the smoking-lung cancer connection took decades of epidemiological head-scratching to figure out.

尽管吸烟能导致肺癌这个令人挠头的难题也是经历了数十年的探索才最终得出了结论。

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The Regent broke the connection and Edwards sat there, his head swimming.

瑞金特切断了连线，爱德华兹坐在那里，头晕目眩。

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As its structure character of beam pumping unit, vibration and noise happen on the joint of connection rod head and beam during operation.

游梁平衡抽油机由于其自身结构特点，在运行过程中，连杆上接头与横梁连接部分经常会出现振动和响声。

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For a window on the colonial connection, head to La Maison de la Revue Noire.

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Mr Haque was killed when he had gone to a village to investigate the murder of the village head in connection with a land dispute.

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Police said a 53-year-old man from Birkenhead was arrested at the Pier Head in connection with the initial incident and a second man, 41, also from Birkenhead, was arrested on Duke Street in the city centre.

BBC: Containment scene