1. 地下的：belonite 针雏晶 | belowground 地下的 | belt 胶带
2. 地面以下：belowgrade 不合格 | belowground 地面以下 | belowminimums 低于最低气象条件
adj
1. underneath the ground
e.g. most of his friends are now belowground
2. under the level of the ground
e.g. belowground storage areas
underground caverns
Synonym: underground