bottom sub

基本解释

Results show that the sub-bottom strata at the brim of Yangtze shoal consists of two layers.
结果表明在东海外陆架扬子浅滩前缘，浅部沉积地层自上而下可分为两层。
However, it is too difficult to do that because no enough available data can be used to estimate the sub bottom hole pressure.
然而，由于能用于估算井底以下地层压力的可用资料太少，使这项研究具有较大的难度，目前还缺乏有效的方法。
In accordance with the characters of composite masonry structure building supported by frame shear wall with wide bay at bottom, a sub structure pseudo dynamic test was carried out.
针对底层大开间组合墙房屋的特点，对模型房屋进行了子结构拟动力试验，测定其抗侧刚度，发现了抽柱对结构性能的重要影响。

It's a helpful little story to remember, because we tend to think of Greece because of its modern geography as that peninsula of which there is a sub peninsula at the bottom, which is Peloponnesus.
这是个很生动的比喻,因为我们都认为现代希腊的,地理环境,在其底部是,一个分离于大陆的半岛,即伯罗奔尼撒半岛
耶鲁公开课 - 古希腊历史简介课程节选