This part discusses synthesized issues of haste return mechanism, rigid object lead mechanism, function creating mechanism and trackbuilding mechanism.
研究急回机构综合，刚体导引机构综合，函数生成机构综合，轨迹生成机构的综合性问题。
2
This included digging up the road, laying the track and then building a strong roof over the top.
这包括挖掘道路，铺设轨道，然后在顶部建造一个坚固的屋顶。
3
Building a database, or keeping track of all the information in your organization, also requires a lot of planning and design.