对于管理模型标记(MDA转换流程中的必要单元)来说，profile也是有用的机制。
Profiles are also a useful mechanism for managing model markings, a necessary element of the MDA transformation process.
换流器单元产生的谐波会流过交流和直流线路。
The converter units generate harmonics which flow in the AC and DC lines.
换流器单元产生的谐波会流过交流和直流线路。
The converter units generate harmonics which flow in the AC and DC lines.
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