毕竟内容是非结构化的，且质量标准更加主观和随意。
Content, after all, is unstructured, and quality standards are thought of to be more subjective or arbitrary.
JFace API 包装了标准（并非不重要的）部件，例如表和树，并实现了结构化内容提供者和标签提供者。
The JFace API wraps the standard (non-trivial) widget, such as table and tree, and implements the structured content providers and label providers.
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