Ventilation is concerned with the supply of fresh air, the removal of contaminants and heat. 通风涉及的是新鲜空气的供应，污染物和热量的排除。
The engineer must analyze the existing stringers and beams for stress reversals caused by the removal of columns or walls and the positioning of the temporary support. 工程师一定分析现有的横梁和为由柱或墙壁和暂时的架定位的排除所引起的应力翻转的梁。
We ask you to cover the expenses of defect elimination. 我们请贵方承担排除故障的费用。
In case of abnormal noise or excessive vibrancy during the running, it is necessary to stop the machine immediately to check and remove the faults. 运转过程中，如发现异常噪声或过大振动应立即停机检查，排除故障。
