- 面: face
- 转动面积: slewing area
- 转动: 转动turn; run; twirl; roll; revolve; rotate 没有动力, 机器就不能转动。 you can't make a machine work without power supply. 那轮子现在转动得很灵活。 the wheel turns freely now.
- 摆动面: plane of oscillation
- 波动面: cove plane; undulating surface
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