标记为“A”的代码段创建了数据库连接，并从数据库中选择一个集合。
The code section labeled "A" essentially creates a database connection and selects a collection within the database.
多年以后，OpenNTF一直在维护一个项目集合和一个代码段存储库。
For the past several years, OpenNTF has maintained a set of projects and a code snippet repository.
在当前存在的大量非结构化mpi程序中，许多基于点对点通信原语的代码段可以替换为相应的结构化集合通信原语。
In current abundant nonstructural MPI programs, many segments of codes based on point-to-point primitives can be replaced by the corresponding structural collective primitives.
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