1·1581年，葡萄牙在和西班牙联盟的情况下拥有自己的法律。
In 1581 Portugal maintained its independent law under a personal union between Portugal and Spain.
2·为了找出导致PTSD普遍原因以及危险因素，研究者们敌对1581名待产的妇女进行了电话调查。
Researchers conducted a telephone survey to examine the prevalence of and risk factors for PTSD among 1581 nulliparous pregnant women.