为了旋转该照片，我们再次求助于convert命令。

To rotate this picture, we again turn to the convert command.

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当它收到左转命令，它会旋转90度到左边。

When it receive a TURN left command, it will rotate 90 degree to the left.

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当它收到左转命令，它会旋转90度到左边。

When it receive a TURN left command, it will rotate 90 degree to the left.

youdao