not essential;not indispensable;may or may not be needed;be as well without it as with it ;

副标题副标题可有可无, 独为一行, 由标记SUBTITLE1注明.
来源:互联网摘选The charm of canals lies in their survival in the face of irrelevance.
运河的魅力在于它面临其地位可有可无的时候竟然幸存下来.
来源:网络文摘精选A holiday isn't an optional extra. In this stressful, frantic world it's a must.
休假并非可有可无。在这个紧张而忙碌的世界,它是必不可少的。
来源:《柯林斯高阶英汉双解学习词典》Thus they will not be superfluous as some people think they are.
因此,工会再不是有些人所认为的那种可有可无的组织了.
来源:互联网摘选Widespread political and economic disarray threatens to make the constitution meaningless.
四处蔓延的政治和经济混乱可能会使宪法变得可有可无。
来源:《柯林斯高阶英汉双解学习词典》Date Date is not required. It is a stand-alone line, begins with marker DATE.
日期日期可有可无,独为一行, 由标记DATE注明.
来源:互联网摘选Thought the instant noodles worked as staple food the age the staple food are also dispensable.
想,速食面当主食的年代,主食也就可有可无了.
来源:网络文摘精选Again, if survival is all we are after, art is far from necessary.
但就像我们先前提及, 如果我们只关心生存, 艺术便可有可无.
来源:互联网摘选
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