They can typically act on hard keys being pressed, like Android's search button and volume controls.
它们可以在被按下的硬式按键上提供典型的操作行为，比如说Android的搜索按钮和音量控制。
2
Powder Metallurgy produces fully dense pressed components and is very economic for high volume production of small simple shapes.
粉末冶金能够制造出精密压缩的组件，对于高容量小形状的产品来说特别经济实用。
3
The machine applies to all kinds of cotton and silk spinning factories count of yarn or oil silk, spun silk pressed into the provisions of, respectively, the volume of rectangular packet.