Amid the current concerns about the federal deficit, reaching toward the stars seems a dispensable luxury—as if saving one-thousandth of a single year's budget would solve our problems.
出自-2013年12月阅读原文
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
非必要的;可有可无的;不重要的
If someone or something is dispensable they are not really needed.