He highlights the need for more efficient templates (to reduce compute time) as well as multiple database access methods within ActiveRecord.
他强调说Rails需要更高效的模板(为了减少计算时间)，同时也需要能通过ActiveRecord访问多个数据库的方法。
They provide a way to wrap database access and business logic, so they can be distributed on multiple servers.
它们提供了一种封装数据库访问和业务逻辑的方法，这样就可以在多台服务器上实现分发了。
Locking is the mechanism that the database manager USES to control concurrent access to data in the database by multiple applications.
锁定是数据库管理器用来控制多个应用程序并发访问数据库中数据的机制。
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