空前的高涨增加
An unprecedented upsurge
以上为机器翻译结果，长、整句建议使用 人工翻译 。
但从根本上讲，一些人相信，过去几个月空前高涨的铜价可能已经起到了效果：降低了需求，刺激了废铜供应的增加。
Fundamentally, however, some believe that the unprecedented prices over the past few months may already have done their job, trimming demand and stimulating higher scrap supplies.
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