before-and-after尖锐对照;情况变化前和情况变化后
You'll find lots of examples of great press releases, a variety of writing styles and even before-and-after press release makeovers.?
您可以找到很多的例子，伟大的新闻稿，各种各样的写作风格，甚至前后新闻稿。
Listing 1 shows an example of an aspect class defining a pair of methods intended to be used as before-and-after advice on a method call.?
清单 1 显示了一个 aspect 类的例子，它定义了在方法调用上，将被用作前 advice 和后 advice 的两个方法。
Two randomized controlled trials (RCTs), one before-and-after study and two retrospective reports on clinical efficacy and safety were retrieved, together with 18 pharmacokinetic studies.?
检索到与临床功效和安全性相关的两个随机对照试验(RCT)、一个前后对照研究、两个回顾性报告,以及18个药物动力学研究
参考资料
李华驹.21世纪大英汉词典.北京：中国人民大学出版社 ，2005-2-1?