Lack of security of tenure was a reason for many families becoming homeless.
居住权缺乏安全保障是许多家庭无家可归的一个原因。
The American reason of Chinese oil security is the new task of this field.
中国石油安全中的美国因素是这一领域中的新课题。
One reason is that the security of CAIS is a relatively new research area.
理由之一是，安彩的是一个比较新的研究领域。
One reason is that the security of CAIS is a relatively new research area.
理由之一是，安彩的是一个比较新的研究领域。
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