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- Mining enterprises inspect the poisonous and harmful substances at the work sites and the percentage of oxygen in underground air to ensure that they meet safety requirements. 第十七条矿山企业必须对作业场所中的有毒有害物质和井下空气含氧量进行检测,保证符合安全要求。
- Huaqingjiayuan used as a reporter in the hotel project with underground air, also probably the case : are dark, dank underground space has become almost common. 记者在华清嘉园被用作旅馆的地下人防工程采访时，情况也大抵如此：昏暗、潮湿几乎成了地下空间的共性。
- Heating ventilation and dusting .Air condition and smoke exhauting engineerings for industry and civil buildings Design for underground air defence engineerings Heat supply plan and design for a city or a region. 工业与民用建筑供热采暖工程通风除尘工程，空调与防排烟工程地下人防工程设计，城市自供热规划与设计。
- ventilation with underground air 地道风利用
- underground air defense facilities 地下人防
- The air in the garden was warm and fragrant. 花园里的空气一片温馨。
- The archers sent their shafts through the air. 弓箭手向空中射出利箭。
- Chain and Giving an Alarm of Coal Underground Air Door 煤矿井下风门的连锁与报警
- Wofking Craft of Underground Air Crossing in Wangzhuang Coal Mine 王庄煤矿井下风桥的施工工艺
- Recently they have laid an underground pipeline. 最近他们铺设了一条地下管道。
- The lack of air in the room make everyone sniffle. 屋子里空气缺乏，使得每个人都频频吸气。
- During the intermission, let's go out for some fresh air. 幕间休息时，我们出去呼吸呼吸新鲜空气吧。
- The missile is delivered from underground. 这种导弹由地下发射。
- The air held a foretaste of a storm. 天气有要括大风的迹象。
- They were suspected of underground activities. 他们被怀疑进行地下活动。
- Moles stay underground most of the time. 钱鼠大部分时间住在地下。
- The air was reeking with the smell of tobacco. 空气中弥漫着烟草的气味。
- He went underground to avoid capture. 他转入秘密工作以免被捕。
- A walk in the fresh air will pep me up. 我在空气新鲜的地方散步就感到精神饱满。
- The cavers discovered a vast underground chamber. 探穴人发现了一个地下大洞穴。
