近地面层;贴地层;底土层

ground layer的用法和样例：

例句

Mail items may be handed over to the doorman or receptionist if such persons are present on the ground floor.一地面层设有管理服务人员或邮件收发处者，各类邮件得交管理服务人员或邮件收发处收领。
The showroom, which is housed in a former Victorian Factory, operates on two levels, with office spaces on the ground floor with the showroom located on the basement level.陈列室，这是住在前维多利亚厂，经营两个层次上，以办公空间在地面层的展厅设在地下一层。

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amplitude-modulation frequency modulation receiver