Song dynasty was one of the most active period of foreign trade.

宋代是我国海外贸易发展十分活跃的时代.

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Your tape - recorder will die during the most active period.

你的录音机在流星雨最活跃的时候会出故障.

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Every entrance to the Announcement, the repetition of various agencies is the most active period.

每到高考发榜时,也是各类复读机构最活跃的时期.

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