名词
中文翻译：Unknown
同义词：
['合同式通风管，合同式空气导管例句：1. The contractor installed the contracted air ducts in the new building.（承包商在新建的大楼里安装了合同式空气导管。）2. The contractor was responsible for installing the contracted air ducts.（承包商负责安装合同式空气导管。）']
例句：
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1. The contractor installed the contracted air ducts in the new building.
承包商在新建的大楼里安装了合同式空气导管。
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2. The contractor was responsible for installing the contracted air ducts.
承包商负责安装合同式空气导管。
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3.The contractor had to replace the old contracted air ducts with new ones.
承包商不得不用新的合同式空气导管替换旧的。