N a tone, not present in the sound received by the ear, whose pitch is that of the difference between the two tones that are sounded 基频缺失
Risk of missing fundamental information requirements of the business.
无法掌握业务的基本信息需求。
The Higgs is the missing piece in the Standard Model, a 40-year-old mathematical framework that links all the known particles and all of the fundamental forces of nature except for gravity.
已经有40年历史的标准模型能将所有已知的粒子和除了重力之外的所有自然力联系起来，这个数学框架中缺少的那一块便是希格斯玻色子。
Interactions in UML 1 were represented either as sequenced message annotations on collaboration diagrams, or as separate sequence diagrams. Unfortunately, two fundamental capabilities were missing.
在UML1中，交互性是由协作图中序列消息的注释或单独的序列图来表现的。
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