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1·The tugboat could draw extra power from the battery when full-power surges were needed.

当需要全功率激增时，拖船可以从电池获得额外的电力。

2·No, extra power not available.

不，没有外加供电。

3·Yes, extra power available.

是的，有外加供电。

4·No extra power needed.

不需额外电源。

5·Add an extra power head, and then remove it after a week or two.

添加额外动力头，然后把它删除后一至两星期。

6·And often utilities cannot provide the extra power needed for an expansion.

公共工程很多时候无法为其扩张提供多余的电力。

7·When extra power is required, the flywheel is connected to the car's rear wheels.

当需要额外动力时，飞轮会连接上汽车的后轮。

8·An antenna and extra power allow the signal to be transmitted over long distances.

信号通过天线与额外功率能够传输很长的距离。

9·These supplies include food, medicine, clean water, and extra power supplies.

这些物品包括：食物、药品、纯净水和额外的供电设备。

10·In general, twenty percent extra power is the standard spinning reserve on the grid.

一般来说，电网的标准热备用是20%。