Pigeons and pollution are both common blights in cities around the world, but a group of engineers in London are hoping the birds can help them tackle problems with air quality.
对世界上许多城市来说，鸽子和污染问题都是常见的危害，但伦敦的一群工程师却希望能利用鸽子来帮助解决空气污染问题。
This paper analyzed the common quality problems of crankshaft after repair, and improved the process in practice, to obtain better use effect.
文章就曲轴修理后常见的质量问题进行了分析，并在实践中进行工艺的改进，以期获得较好的使用效果。
The leakage in external walls is one of the common quality problems in the construction.
外墙渗漏问题，是建筑工程质量问题中常见的一种。
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