underpin
verb [ T ] uk/ˌʌn.dəˈpɪn/ us/ˌʌn.dɚˈpɪn/ -nn-
architecture formal or specialized支撑;加强;巩固;构成（基础）
to give support, strength, or a basic structure to something
He presented data to underpin his argument. 他提供了一些数据来支持他的论点。
Gradually the laws that underpinned (= formed part of the basic structure of) apartheid were abolished. 以种族隔离制度为基础的法律被逐步废除了。
When restoring the building, the first priority was to underpin the exterior walls by adding wooden supports along the foundations. 修复这座建筑物时，首先要做的是沿着地基给外墙增加木支撑。