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1·Well known is the structural weakness in Groupon's business model, being the low cost of entry for competitors.

众所周知的是Groupon商业模式的结构性弱点，即竞争对手进入的门槛很低。

2·Boeing yet again postponed the maiden test flight of its 787 Dreamliner, this time because of structural weakness in the area where the wing attaches to the body of the aeroplane.

波音公司又一次推迟了波音787梦想飞机的首次试飞。这次是因为机翼与机身的连接区域的结构性缺陷。

3·Since carbon nanotubes conduct electricity, sending a current through the paint would help engineers to detect structural weakness through changes in the paint’s electrical properties.

碳纳米管可以导电，能沿着涂料传导电流，让工程师通过涂料电性质的变化探测出结构中的薄弱环节。

4·Since carbon nanotubes conduct electricity, sending a current through the paint would help engineers to detect structural weakness through changes in the paint's electrical properties.

碳纳米管可以导电，能沿着涂料传导电流，让工程师通过涂料电性质的变化探测出结构中的薄弱环节。

5·On the basis of analyzing and discussing the structural weakness of Three-Ring Gear Reducer, this dissertation gives a new scheme of planetary gear reducer with few teeth difference.

本文分析和讨论了现有的三环减速机在结构上存在的缺陷，并针对三环减速机的缺陷提出了一种新的改进方案。