人力资源十分昂贵，而且与大型采购项目——例如英国将来的航母项目，这一项目受到严格规定的合同保护——相比是更易受攻击的目标。
Manpower is both expensive and a softer target than big procurement programmes, such as Britain's future aircraft-carriers, which are protected by tightly drawn contracts.
16世纪和19世纪北也门成为奥托曼帝国的一部分；在一些时期，伊玛目控制了南也门。
By the 16th century and again in the 19th century, north Yemen was part of the Ottoman Empire, and in some periods its Imams exerted control over south Yemen.
下一节目五分钟后开始，现在先播放些音乐。
The next programme starts in five minutes: in the meantime, here's some music .
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