For example, certain laws require that corporations archive e-mails and make them accessible.
例如，某些法律要求公司归档电子邮件并且使之可供查询。
Technology known as digital rights management can make e-books unreadable once they have reached a certain time or user limit.
数字版权管理技术可以使电子图书在达到一定期限或使用限制后失效。
You can make certain faces come to life by giving them different expressions, e. g., happiness, anger.
你可以通过给脸谱画上不同的表情使脸谱显得逼真，有生气，例如高兴、生气。
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