北京市电梯技工开始试行等级制。

Beijing began to launch the grading system to classify the elevator workers.

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目前，北京市最高级别的电梯技工寥寥无几。

There are few workers with the highest level in Beijing.

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目前，北京市最高级别的电梯技工寥寥无几。

There are few workers with the highest level in Beijing.

youdao