He then proceeded to teach himself geology, and when he was twenty-four, he went to work for the company that was excavating the Somerset Coal Canal in the south of England.

后来，他又自学了地质学；24岁的时候，他开始为那家挖掘英格兰南部的萨默塞特煤炭运河的公司工作。

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Now the Chinese government is doing new work on the Grand Canal.

现在中国政府正在大运河上实施新的工程。

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He returned to work earlier this month after successful surgery to plug a pin-size hole in the bone covering the semicircular superior canal in one of his ears.

本月早前，在将覆盖着上半规管的引脚大小的骨头缺口填补的手术成功之后，他重新回到了工作岗位。

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Many died of disease. After more than a month of digging, engineers decided that the canal would not work.

VOA: special.2009.11.19

He said vibrations caused by drilling for ordinary fillings could damage the nerve and cause root canal work later in life.

BBC: 'No need for dentist's drill'

So far Mr Hansen has treated nearly 600 patients needing root canal work with this method and claims he has achieved an almost 100% success rate.

BBC: 'No need for dentist's drill'

He said that although the work takes longer than traditional methods, it is cheaper as it eliminates the need to carry out costly root canal work and crowns.

BBC: 'No need for dentist's drill'