step ventilation的意思|示意

Therefore, commissioning and maintaining ventilation and air conditioning system is an essential step during the construction and later maintenance.

因此，通风、空调系统的调试与维护是通风空调工程施工及后期维护中的必不可少的工序。

Many people think, after the installation of ventilation pipe, the task is almost over, but do not know this idea is not desirable, this is just the first step.

不少人认为，在通风管道安装完之后，任务也就差不多结束了，却不知道这种想法是不可取的，这仅仅是第一步而已。

Direct-Vent panels provide superior ventilation with every step.

直泄面板的每一步提供了优越的通风。