淘汰步骤的英文：
filtering procedures

Broadband filter: A filter that transmits a range of light waves.
阔波段滤片:能让一个范围的光波透过的滤片。

Light filtered through the blinds.
光线透过了帘子。

The filter is now ready for operation.
这种滤器目前即将投入运转。

Some of this filtering is beneficial.
这种过滤有些是有益的。

Charcoal is used to filter water.
木炭是用来过滤水的。

This is a reduction procedure.
这是个简化方案。

The representation of a procedure created by the invocation of that procedure.
由过程调用产生的该过程的表示。

Actions like these (with only a procedure component) are procedural actions.
这样的操作（只有一个过程部件）称为“过程操作”。

routine fire procedure
常规消防措施

The law warrants this procedure.
这一程序是法律批准的。