This method regulates speed by changing the number of steps of the additional resistor in the rotor circuit, so it's hard to realize smooth speed-regulation, also its performance is poor.
该方法是通过调节转子回路附加电阻的有级调速，难以实现平滑地调速，而且调节性能差，调速过程中大量的转差功率通过转子回路电阻转化为热能消耗掉了。
As the saying that no pain, no gain. We also need to work hard to realize our goals.
俗话说，没有付出，就没有收获。我们还需要通过努力工作来实现我们的目标。
To try hard to build Dalian into a famous cultural city is not only one of goals of building Greater Dalian, but also the important driving force to realize this goal.
努力创建文化名城，既是“大大连”建设的目标之一，又是实现“大大连”建设目标的重要推动力。
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