考研英语

　　But universalism is expensive and should be reserved for when it is clear that providing two-tier, means-tested services would erode quality and levels of provision and create harmful social stigma.

　　句子的解析：

　　词汇突破：

　　1.Universalism 普世主义

　　2.Reserved for 预留

　　3.Means-tested 经过考验的

　　4.Levels of provision 供应水平，这么可以翻译为普及水平；

　　5.Erode 侵蚀

　　6.Social stigma 社会污点

　　确定主干：

　　universalism is expensive and should be reserved for when

　　切分成分:

　　(When) it is clear that providing two-tier, means-tested services would erode quality and levels of provision and create harmful social stigma.

　　It是形式主语，真的主语是后面that 引导的从句；

　　That引导的从句中主语是：providing two-tier, means-tested services

　　独立成句：普世主义“造价不菲”，应预留给特殊的时刻——当提供经过考验的两级服务会明显侵蚀质量、影响普及水平、并造成恶劣的社会污点的时候。