... 炮眼底扩大 blast-hole springing; burning; springing 平底扩孔 counter boring 平底扩孔钻 counterbore drill ...
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counter flush boring 反向冲洗钻进
A few days later, she returns and says to librarian at the counter, "This book was very boring."
几天后，她来还书，对图书管理员说：“这本书太没意思了！”
By means of conversion switch on counter, the counting assembly may indicate axial travel that the boring bar moves automatically or manually and may indicate total axial travel.
通过变换计数器上的计数方式，可实现自动进给计数和手动快速下降(或上升)计数，并可得到总进尺计数。
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