The US Army uses two distinct families of weapons in 5.56 x 45 mm calibre: the M16 rifle and the derivative M4 carbine form one group, the M249 Squad Automatic Weapon the other. The M249, a licence-produced and much-modified version of the highly successful Belgian FN Herstal Minimi light machine gun, was purchased in the 1980s and the guns are now wearing out and need replacing. The US Army has also decided to replace the M16/M4 family with a different design, for more complex reasons.
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The US Army has also decided to replace the M16/M4 family with a different design, for more complex reasons.
出于更加复杂的原因，美国陆军同时决定用一种不同的设计更换M16/M4枪族。
Among the reasons for the slower service, today there are more choices on the menu, and the products themselves are more complex and take longer to prepare.
服务速度变慢的原因有：如今菜单上的选择更多了，而且产品本身也更复杂，准备时间更长。
In other countries, where there is more choice in the matter, the reasons for veiling are more complex.
在其它国家，女性在该问题上拥有多种选择，戴面纱的原因就更为复杂了。
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