上海申通地铁集团公司在一次声明中称，根据初步排查，电力突然中断致使地铁运营信号系统失灵，导致不得不对列车实行人工调度。

According to an initial investigation, a sudden loss of power caused the signal system to fail, forcing the trains to be operated manually, Shanghai Shentong Metro Group Company said in a statement.

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本文对如何实行英语互动教学进行了初步的探讨。

This article focuses on how to carry out interactive teaching method in English classroom teaching.

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美国各州初步尝试实行管理式医疗已经有数十年了。

States have dabbled in managed care for decades.

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