以下为句子列表：
英文: As silo is required and it is not convenient for receiver and launcher installation and pig disassembly, underground installation is not adopted now.
中文: 地下需设发射井，收发球筒及装卸清管器均不方便，现已不采用。
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英文: The installation of pig receiver &launcher is divided into above ground installation and underground installation.
中文: 收发球筒安装分地面安装及地下安装两种形式。
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