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Transcript:
This is Siberia - over 1,000 metres below ground.
And miners at Russia's largest nickel mine were given the surprise treat of some cheerful music.
Musicians swapped their stage costumes for hard hats and overalls for the day.
The company says it's all part of a plan to boost productivity and hope to hold more underground cultural activities to keep the positive attitude going.
Vocabulary:
nickel mine 镍矿
treat 请客；款待
<swapped 交换
boost productivity 提高生产率
positive attitude 积极态度
