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B1 Intermediate
Chinese
8:11
Educational
堪称地下的航空母舰——全断面隧道掘进机 破解困扰隧道掘进行业50多年的“卡机”世界级难题《大国重器Ⅱ》第3集【CCTV纪录】
Learning Stats
B1
CEFR Level
5/10
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