But the functional classification focuses on how much that joint can move.

但是功能分类关注的是关节能移动多少。

And we went over the structural and functional classifications of your joints, along with the major types of movement that they make possible.

我们了解了关节的结构和功能分类，以及它们使之可能的主要运动类型。

And of course, highways are at the top of the functional classification system.

当然，高速公路是位于功能分类系统的顶端。

You may notice by now that boulevards aren't in the functional classification system.

您现在可能注意到林荫大道并不属于功能分类系统。

But the traditional functional classification system supports the tree-like road network structure found in the suburbs.

但传统的功能分类体系支持郊区树状的道路网络结构。

Boulevards also predate the functional classification system and are an important part of our urban history.

林荫大道也早于功能分类系统，是我们城市历史的重要组成部分。

It may be in part because of a transportation planning term called " functional classification." It's the way traffic engineers divide up different kinds of streets.

这可能部分归因于交通规划术语“功能分类”。这是交通工程师划分不同类型街道的方式。