今年美国签证形势整体开始发生转变，敏感专业的审查周期从以前的长达两个月缩短到2~3周，且因专业审查而遭遇申请失败的人数极少。但是，如果申请者所学的专业属于敏感专业，为了能按时到达学校，一定要提早向所在辖区的大使馆或者领事馆申请签证。

美国留学 敏感专业详细列表

The State Department maintains a Technical Alert List, also known as the sensitive major list, to guide their evaluation of visa submission.

Sorted by rate.

CRITICAL FIELDS LIST

A. CONVENTIONAL MUNITIONS: Technologies associated with:

-- Warheads and other large caliber projectiles

-- Reactive armor and warhead defeat systems

-- Fusing and arming systems.

-- Electronic countermeasures and systems

-- New or novel explosives and formulations

-- Automated explosive detection methods and equipment