日本高清色视频在线视频在,国产香蕉97碰碰视频碰碰看,丰满少妇av无码区,精品无码专区在线,久久无码专区免费看,四虎欧美精品永久地址99,亚洲色无码一区二区三区

文字稿:

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 詞匯:

nickel mine 鎳礦

treat 款待

swapped 替換了

boost productivity 提高生產(chǎn)力

positive attitude 積極的態(tài)度