自他们开始工作以来，我花费在上班路上的时间增加了一倍。
Since they started working, the time it takes me to get to work has doubled.
自顶向下的实现需要在项目开始时完成更多计划和设计工作。
A top-down implementation requires more planning and design work to be completed at the beginning of the project.
在更正式的定义中，主题专门化从包含元素开始，自顶向下工作。
In a more formal definition, topic specialization starts with the containing element and works from the top down.
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