上市公司的公告问题，是作为上市公司的股份有限公司对于公司股东、社会以及证券市场所负有的法定义务。

The issue of announcement of listed corporations concerns the legal obligations to the shareholders of the corporation, society and stock market which impose on public limited liability corporations.

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上市公司的退市制度是指通过法定程序将已经不符合上市条件的公司退出证券市场的法律行为。

Delisting system means the legal act de-listing the public corporation which has lost qualification in the stock market.

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