One sign of hope is a new way to make the natural defenses of mosquitoes resistant to the Plasmodium parasite.

VOA: special.2010.04.20

What is a sign? Saussure's famous diagrams make it clear enough.

符号是什么，让我们来看看索绪尔有名的图标。

耶鲁公开课 - 文学理论导论课程节选

The Newscorp's rising stock price was a sign that Rupert Murdoch had some idea how to make money and The Wall Street Journal was not doing as well, so it got gobbled up.

新闻集团,全球最大的媒体集团之一默多克家族控制其30%的股份,是鲁珀特·默多克有能力赚钱的标志,而《华尔街日报》做得不好,所以它被吞并了

耶鲁公开课 - 金融市场课程节选

But in a possible sign of progress, Mitchell will visit several Arab countries and then make an unscheduled stop in Israel on Friday for more talks.

VOA: standard.2009.09.16

And what this means is we can use --take any arbitrary idea in the world, the idea of a chair or a story or a country, and make a sound or a sign to connect to it.

符号任意性是指,我们可以拿来世间任何想法,比如椅子,故事,或是国家,再发明一种声音或符号来与之相联系

耶鲁公开课 - 心理学导论课程节选