莫斯科警方提高了机场和地铁安全警戒级别。

Moscow police has tightened the security in the city's other airports and metro system.

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你真的认为我们在这时候去乘地铁安全吗？

Do you really think safe for us to take the subway at this hour?

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为确保地铁安全请协助我们随身、随时携带好您的行李。

Help us keep the Tube safe by keeping your bags with you at all times.

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