随后钻头处的压力降使扩眼工具处于打开状态，当流速下降时弹簧将活塞收回至原处。
A pressure drop through the bit maintains the tool in the open position while the return springs close the pistons when flow decreases.
不过，可以通过单击“工具箱”窗口右上角的“自动隐藏”按钮，将此窗口收回到位。
However, you can pin the Toolbox window into position by clicking the Auto Hide button in the upper right corner of the window.
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