below grade

基本解释

The glass blocks covering the walls and roof allow natural light to illuminate the entries and extend below-grade through the diagonal space of the stairs and escalators.
玻璃块覆盖的墙壁和屋顶可以让光线照射进来并且向下延伸，通过楼梯和自动扶梯实现对角空间效果。
Prevents nozzle problems associated with settling of all competitive below-grade manholes. Non-settling, never-sink manhole. No problem with bellows collapsing unlike competitive products.
使用具有竞争力的检修井能够防止喷管问题的发生。我们生产的检修井永远不会沉降和下沉。也不会产生波纹管塌陷的问题。
www.e-gtm.com.cn
No longer completely natural, the stream is a mix of water from the Han River, below-grade runoff, and treated water from a sewage plant, which enters the canal at various points along its course.
修复的运河不再是全天然的，而是由Han河、低于一般标准的径流、污水处理厂的再净水三者的混合水，这些水在河道不同的地方流入。

Below-investment grade paper yields more than 8%, as do A-rated preferred stocks.
FORBES: Magazine Article
Since March 2009, those factors have both been big tailwinds for below-investment grade paper, helping drive both the JNK and HYG 50% higher in price over the past year and a half.
FORBES: Ford And Icahn Look Like Better Bond Bets Than Uncle Sam
Below-investment grade bonds rarely trade at all.
FORBES: Out Of Treasuries And Boldly Into The Fire