The system has been debugged and the massive experiments have been done in the laboratory, and adjustable-speed function has been realized.
在实验室里对整个系统进行了调试和大量的实验，实现了调速的功能。
The system has been debugged and the massive experiments have been done in the laboratory, and adjustable-speed function has been realized.
在实验室里对整个系统进行了调试和大量的实验，实现了调速的功能。
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