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 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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Consists of gas tube, manometer, volume controller, clamp and scale. No danger of pollution without mercury.

由气柱玻管、压力表、定容机构、固定架和体积标尺组成。本仪器不使用水银，消除了污染。

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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'