'I would not own resource companies, and I would short physical copper,' Roche said.

罗奇说，我不会持有资源类股，我会做空实物铜。

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For copper, she said, the LC50 (the concentration lethal to half of any given species over a certain time) decreases with temperature - meaning that toxicity increases.

她说，对于铜来说，半数致死浓度lc50(一定时间内受试动物半数死亡的毒物浓度)随温度减弱-这就意味着毒性增加。

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The copper producer will take delivery of half the ore, he said.

他还表示，这家铜生产商将提取一半的铜矿石。

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That improved macroeconomic confidence drove inflows into industrial metal ETPs, led by demand for copper, he said.

FORBES: Gold ETPs See Greatest Inflows In Third Quarter -- ETF Securities

Commerzbank analysts said copper struggled to gain on the recent positive Chinese economic data over into the new week of trading.

FORBES: FOCUS: Speculators Start Buying Precious Metals Futures, Options Again -CFTC

Several analysts said copper could fall some more in the next couple of months due to this uncertain backdrop, and also because of slower seasonal demand during the vacation season and maintenance shutdowns in the Northern Hemisphere.

FORBES: Copper Expected To Languish Over Summer But Pick Up Into Year-End