1. Check the expiration date on the package to ensure that the buttermilk is fresh. 检查外包装的截止日期，以保证白脱牛奶是新鲜的。
2. This topic explains how to extend the application block by adding your own backing store and your own expiration policies. 这个主题解释了如何扩展应用程序块通过加入你自己的后台存储和你自己的终止策略。
3. Note: If you use an expire-by-uses certificate, or store the expiration information in the key, you cannot also put the number of copies to allow in an unsigned key. 注意：如果你使用一个按使用次数终止的证书，或者储存终止信息在密匙里，你不能也放置允许的副本的数量在一个无符号密匙里。
英英解释
n.
1. a coming to an end of a contract period
2. euphemistic expressions for death
3. the act of expelling air from the lungs
