dummy block

基本解释

To fill a block with dummy data, usually zeros or blanks.
用哑数据（常是零或空白）充一个数据块。
The fixed dummy block for extruding aluminium materials developed by USSR, USA and Japan are reviewed. The domestic fixed dummy block are introduced.
对前苏联、美国和日本铝挤压工业开发的固定挤压垫装置进行了评述；介绍了国内研发的铝挤压用固定挤压垫装置。
This time, however, you need one extra style rule to hide the dummy image slideshow markup you added to the page. When you're done, the noscript style block will look like Listing 17
但是，这一次需要用一个额外的样式规则隐藏前面添加的哑图像幻灯片标记。