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