求翻译：国内对椭圆振动超声切削的研究在近几年才刚刚开始，几年来分别就椭圆振动超声切削的机理及应用开展了研究，取得了初步的成果。是什么意思？

Domestic research on the elliptical vibration ultrasound cutting in recent years has only just begun, several years on the elliptical vibration ultrasound cutting mechanism and to carry out research, preliminary results.

In the ellipse vibration ultrasound cutting research in recent years it has only just started, respectively, over the past few years on an elliptical vibrating ultrasonic cutting machine, and application of the research has been conducted, the results were achieved.

Domestic in only then just started in recent years to the ellipse vibration supersonic cutting research, for several years separately have carried out the research on the ellipse vibration supersonic cutting mechanism and the application, have yielded the preliminary result.

Domestic research on ultrasonic elliptical vibration cutting in recent years has only just begun, several years respectively on ultrasonic elliptical vibration cutting mechanism and applied research was carried out, has achieved preliminary results.

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