| 1. | A filter traps dust from the air .
过滤网可存住空气中的尘埃。 |
| 2. | Under appropriate conditions a multilayer may also be employed as a filter .
在适当条件下，多层膜还可作滤波器。 |
| 3. | It is possible to use a plutonium foil as a filter to remove the second-order contamination .
可用钚箔作为过滤器消除二级干扰。 |
| 4. | A satisfactory approximation to monochromatic light can be obtained with a filter placed in front of the arc .
在碳弧前面放一个滤光片就可以得到令人满意的近单色光。 |
| 5. | The crude dye is collected on a filter and then recrystallized from ethanol containing a small amount of piperidine .
粗染料过滤，然后在少量含有哌啶的乙醇中重结晶。 |
| 6. | Use a filter funnel and paper to filter the mixture of copper sulphate, sand and water into a second jar .
用过滤漏斗和过滤纸把硫酸铜、砂子和水的混合物过滤到另一个广口瓶里。 |
| 7. | In drainage of agricultural lands, a filter or gravel envelope is used to prevent the entrance of fine sand and silt into the drains .
在农田排水中常常采用砾石或过滤层来防止粉细砂和泥沙进入排水沟。 |
| 8. | Earlier in this chapter we introduced the concept of impulse response as the output of a filter whose input is a simple spike .
在本章的前面，我们介绍了当滤波器的输入是一个简单的尖锋脉冲时，作为该滤波输出的脉冲响应的概念。 |
| 9. | The scanning of the film by the photometer in the spacial domain is equivalent to the operation of a filter on a signal flowing through it in the time domain .
在空间域用光度计进行扫描，和时间域中滤波器对所通过的信号进行运算等效。 |
| 10. | Creates a filter string for the file dialog box
为文件对话框创建筛选器字符串。 |
