菲律宾的公主港地下河国家公园的主洞入口处，停靠着几只空空的桨船，在等待桨手的到来。
Empty paddle boats await rowers at the main cave entrance at Puerto Princesa Subterranean River National Park in the Philippines.
每台机组母线通过各自的母线洞与主变压器连接。
The omnibus bar of each set is connected with main transformer through its omnibus bar cave.
每台机组母线通过各自的母线洞与主变压器连接。
The omnibus bar of each set is connected with main transformer through its omnibus bar cave.
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