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.
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.
过程很简单：两个陌生人轮流问对方36个问题，问题越来越私人化，然后四目相对，一言不发地对视4分钟。
So the procedure is fairly simple: two strangers take turns asking each other 36 increasingly personal questions and then they stare into each other's eyes without speaking for four minutes.
本文解剖观察了我国有代表性的鲨类脑颅共32种，分隶于8目14科24属。研究结果认为鲨类的脑颅共可分为9个式型和12个亚型。
This paper presents a comparative study on the neurocrania of 32 representative species of sharks of China, belonging to 24 genera, 14 families and 8 orders.
本文解剖观察了我国有代表性的鲨类脑颅共32种，分隶于8目14科24属。研究结果认为鲨类的脑颅共可分为9个式型和12个亚型。
This paper presents a comparative study on the neurocrania of 32 representative species of sharks of China, belonging to 24 genera, 14 families and 8 orders.
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