... extirpator深耕中耕机 extra hard steel超硬钢 extra high pressure超高压 ...
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... They Worked Extra Hard 他们工作特别努力 Think Extra Hard 想加倍努力 Extra Hard Steel 特硬钢 ; 超硬钢 ...
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extra-hard steel 极硬钢
dead-hard steel extra-hard steel 极硬钢
extra check hard steel 极硬钢
·2,447,543篇论文数据，部分数据来源于NoteExpress
Further, says Peabody, world steel production is up 8% this year, requiring an added 75 million tons of extra hard and hot-burning metallurgical coal.
FORBES: Peabody Earnings Up, Coal Supercycle Just Beginning
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