No one was supposed to walk on the grass.

请不要在草地上行走。

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The public are requested not to walk on the grass.

请大家勿在草地上行走。

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In some parks it is allowable to walk on the grass.

有的公园容许在草地上走。

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In some parks it is allowable to walk on the grass.

有的公园容许在草地上走。

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