很多种类的工件可能不用选择机加工操作就可以做出来。
A great variety of workpiece may be produced without resorting to a machining operation.
硬质合金刀尖（或陶瓷刀尖）根据采用它们的 机加工操作，可以有不同的形状。
The carbide tips (or ceramic tips) can have different shapes, depending upon the machining operations for which they are to be employed.
现有技术中传声器的背侧孔典型地要求在制造过程中于硅片的后表面上进行一种二次机加工操作。
The backside holes of prior art microphones typically require that a secondary machining operation be performed on the rear surface of the silicon wafer during fabrication.
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