Many college students act as guides during their summer vacation.

许多大学生在暑假里担任导游。

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They always act as tourist guides.

他们总是当导游。

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"Friends can act as free guides, offer me free accommodation and give me valuable tour information, which saves money, time and energy, " he said.

葛睿表示：“朋友既能充当义务导游，又能提供免费住宿，还可以为我提供有用的旅游信息，真是省钱、省时、省力。”

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As directive principles of state policies they act as guides for states, and are not legally enforceable.

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They offered to act as tour guides.

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