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drill down （問題などを）掘り下げる

Let's drill down for a moment into each of these three cases, teasing out some of the essential elements of difference.

homegrown applications　自作のアプリケーション

true child　申し子

Like Google, DoubleClick is a true child of the internet era. It harnesses software as a service, has a core competency in data management, and, as noted above, was a pioneer in web services long before web services even had a name.

darling 寵児

The first of Web2.0 principles was "The web as platform." Yet that was also a rallying cry of Web 1.0 darling Netscape, which went down in flames after a heated battle with Microsoft.