safety是不是可数名词

　　A test of governors and safeties shall be made annually at the employer's convenience.

　　在业主方便时，对限速器和安全装置进行年度测试。

　　And you should also start trying to find some safeties.

　　或者你应该找一些容易进的大学。

　　Migrant workers are vulnerable groups of society, and the government plays a major role on the issues of guaranteeing their lives and safeties.

　　农民工是社会的弱势群体，政府要在保障他们生命安全的问题上发挥主要的职能。

　　Nowadays more and more attentions have been paid to the safeties of meat products, which is a major problem, and we have to solve.

　　肉类食品安全问题越来越受到人们的关注，是我国新时期肉类加工业必须解决的一个重大问题。