A concept is a set of semantic features.

概念是语义特征的集合。

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However, from a systemic functional viewpoint, cohesion, though realized by formal features, is itself a semantic concept.

然而，从系统功能语言学的观点来看，尽管衔接是由形式特征来体现的，但衔接本身是一个语义概念。

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In content-based image retrieval systems, the inconsistency between image low-level features and the concept of high-level expressed by images lead to system semantic gap problem.

在基于内容的图像检索系统中，图像低层特征和图像所表达高层概念之间的不一致性导致系统出现语义鸿沟问题。

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