lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower" 同义词：foundation, base, fundament, foot, groundwork, substructure,
例句与用法
1.
Further adding to occupant safety , frontal impacts are absorbed by crumple zones directed into y - shaped chassis members and the main understructure ? the strongest part of the chassis 正面的撞击由溃缩区吸收并传递到y型底盘部件和主要支承结构-地盘最坚实处，从而进一步保护乘客安全。
2.
Its setup thoroughly solved the problem of domestic applied understructure building for the beidou satellite locating and navigational system , paving both for the domestic large - scale use and industrialized development 神州天鸿民用网管系统的建立彻底解决北斗卫星定位导航系统的民用基础建设问题，为北斗卫星定位导航系统的民用大规模应用和产业化发展奠定了坚实的系统基础。
3.
In accordance with the characteristics of multi - units and high - lift pump station and the application to the actual project , the main pumping house and the auxiliary pumping house are arranged in combination with the intake pond , and then the understructure is integrated with the main pump house ; with which the working space is fully used with convenient management and investment saving 摘要结合工程应用，针对多机组、高扬程离心泵站的特点，将主副厂房及进水池结合布置，下部结构与主厂房形成整体结构，既便于维护管理，又节省投资、充分利用空间。
4.
In the design , the construction measures such as application of shrinkage - compensating concrete , arrangement of spacing layer between the foundation rock and the bottom slab , adding outside waterproof layer , flexible connection between outlet pipe with side - wall , integerated concrete placement of pump seat with bottom slab and design of reinforcement with application of advanced calculation theory are used according to the characteristics of lager span , larger volume and complex loading conditions of the understructure 针对下部结构跨度大、体积大、受力复杂的特点，在设计中采取多种措施，包括采用补偿收缩混凝土、基岩与底板间设隔离层、增设外防水层、出水管与边墙采用柔性连接、机座与底板整体浇注、采用先进计算理论指导配筋。
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