求翻译：1. 常规生产线上的动火作业：包括阀门、气缸、总装和机加工的焊接、切割、打磨。此类动火作业无需申请工作许可，但应确保作业区域安全。是什么意思？

1 production line of conventional hot work: including valves, cylinders, assembly and machining, welding, cutting, grinding. Such hot work without a work permit, but should ensure that regional security operations.

. * 1 conventional production line, the interactive fire operations: include valves, cylinders, assembly and machining of welding, cutting, grinding. Such interactive fire operating without apply for work permits, but it should ensure that operational and regional security.

1. On the conventional production line gets angry the work: Including valve, air cylinder, general equipment department and machining welding, cutting, polish.This kind gets angry the work not to need to apply for the work permission, but should guarantee the task area security.

1. on the general lines of hot work: includes valves, cylinders, Assembly and welding, cutting, machining and grinding. Such hot work do not need to apply for a work permit, but security should ensure that the operational areas.

We keep the city clean is paramount