reaming drill press

it used the unstructured tetrahedron unit to produce the computation grid on the geometric model of the dust extraction fan blade cascade and back flow passage flow field, and increased density in the area of blade channel and gaps which flow changed fiercely.

在建立的除尘风机叶栅及后流道流场几何模型上，采用非结构四面体单元分块生成了计算网格，在流动变化剧烈的叶片通道和间隙区域内适当加密网格。

Design and manufacture the back passage of the system, which make Single Chip Microcomputer send out faint controlling signal to control the on/ off of piezoelectricity valve through Solid State Relay.

对系统的后向通道进行设计与制作。使单片机输出的微弱的控制信号能够通过固态继电器控制压电阀的开启，以最终控制进入调节阀气室的进气正三日~与邑。

and i ran back along the passage.

于是我就顺着走廊往回跑。

She went back down the passage and out on to the front verandah.

她走回走廊里,然后又坐到前面的阳台上.