It involved the construction of about 50,000 tube Wells in the fadama lands for small scale irrigation, as well as simplifying the drilling technology for the tube Wells.

项目的内容包括新建50000个机井，用于“发达玛”地带的小型灌溉，同时简化打井技术。

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The production has been nearly 20 years from the time scale of vacuum tube, product structure, process and equipment has been very mature, the thermal performance of the already very difficult.

真空集热管从规模化生产至今已有近20年时间，产品结构、工艺、设备已很成熟，热性能指标的提高已非常难。

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The tube is graduated so that flow rate can be read directly on a linear scale.

管子上刻以标度，以便在线性标度上可以直接读出流动速率的数值。

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"Everyone involved in the Tube drivers' dispute needs to recognise the importance of London retailing and the damage disruption on this scale will cause, " he said.

BBC: Tube strike: Boxing Day walkout 'could harm retailers'