一种无杆压力疏通器，主要包括有引管、连管、手柄、压缩圈以及调节爪。
Disclosed is a pressure dredging device without a rod, mainly comprising a draft tube, a connecting tube, a handle, a compressing ring and a regulating pawl.
与号角连接的高频驱动单元是一个频响平滑宽广的2“侯管(2.5”音圈振膜)的钕磁钢精密高频压缩驱动器。
Connected with the high-frequency horn driver is a smooth and wide frequency response 2 "Hou tube (2.5" voice coil diaphragm) neodymium magnet compression driver high frequency precision.
雪圈是以一英寸或多一些的方式把雪除去而做成的，不是将雪融化，或将其压缩而成，表明了该设计不是以脚践踏雪的手段能完成的。
The circle were laid by removing an inche or more of snow, rather then melting the snow down, or compressing it, demonstrating that tromping feet were not the means by which the design was laid.
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