For now, however, I'd complete the Subject property as if it were a meta description.

但就目前而言，我完全就好像它是一个元描述的主体属性。

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There are many differences between the study on subject, object, meta-language tool, the form of achievement, ways, function and evaluation etc of the Logic in old times and in modern times.

古今墨家逻辑研究主体、对象、元语言工具、成果形态、层次、方法、作用、后果和评价等元性质，有根本差异。

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This article makes introduction and discussion on sear ch tools, which involves search engine, subject directory meta search engine, gopher .

本文对因特网搜索工具进行了介绍和探讨，涉及到机器人搜索引擎、主题目录、元搜索引擎、浏览器等。

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