我们的团队严格遵循SDL（软件开发生命周期）来确保软件质量。

Our team strictly follows the ___SDL to ensure software quality.

这个应用程序使用SDL来处理音频和视频输出。

The application uses ___SDL to handle audio and video output.

采购部门在供应商数据清单中新增了三个合格供应商。

The purchasing department added three qualified suppliers to the ___SDL.