求翻译：Of course, this means that the censors -- both government directors and in-house corporate censors -- are always a few steps behind the rumors, waiting and watching for discussions to erupt and then trying to quiet them again. It's a precarious effort. A few years ago, several competing microblogging platforms existed in China, but Weibo has since emerged as the clear winner -- in no small part because its parent company, Sina, has figured out how to manage the tricky balance between allowing enough discussion to satisfy users and acting quickly to stifle it when need be. Of course, the company needs the government's approval to keep from being shut down, and for now, it's earned it.是什么意思？

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