A wall is only as good as its foundation, and all retaining walls should be built on structurally sound, compacted foundationsub-base material.
墙只是作为一个良好的基础，而应建立在所有挡土墙结构健全，基础压分的物质基础。
2
And proposed the advantageous exploration sub-area in these achievement's foundation.
并在这些成果的基础上提出了有利的勘探区块。
3
These provided theory foundation for SPM. 1 The arthropod community was divided into four sub-communities, which were phytophages, predators, parasitoids and neutralities.