近期以来，软件开发渐渐被视为产生能帮助利用经济选择性的效益的活动。
Recently, software development is seen as something that generates revenue that can help to exploit economic options.
因而寻找选择性5 - HT _ (2c)受体激动剂成为一个药物研究及开发的热点。
So searching selective 5-ht_ (2c) receptor agonists has become a focus in drug research and development.
例如，屏幕阅读器不能帮助盲人阅读Web页面上的信息图像，除非开发人员为那些图像提供了选择性的文本。
For example, a screen reader cannot help a blind person read informational graphic images on a Web page unless the developer has provided alternative text for those images.
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