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Mineral exploration made important progress in .coal, uranium, iron, gold, silver, copper, nickel, zinc, lead, antimony, tungsten, molybdenum, vanadium, kainite and characteristic non-metal.

查在煤、铀、铁、金、银、铜、镍、铅、锌、锑、钨、钼、、钾盐及特色非金属矿等方面取进展。

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on schedule, on second thoughts, on show, on the air, on the alert, on the analogy of, on the average, on the basis of, on the battlefield, on the bottom,

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3G, 401(K), a,

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CNN 10 学生英语 2018年9月合集

Columbia University researchers using this machine found the vapor has toxic metals like chromium, nickel, zinc and lead and as we know, there's no safe level of lead.

哥伦比亚大学的研究者种机器发了气雾中有有毒金属,例如铬、镍、锌、铅,而我们知道,只要铅就是危险的。

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on the hook, on the job, on the line, on the loose, on the nose, on the one hand, on the other hand, on the other side, on the outs, on the part of,

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3G, 401(K), a,
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