In May prices for copper, nickel and other metals rose to record levels, although they have since fallen a bit.
5月，铜、镍和其它金属价格升至创纪录新高，尽管此前曾有小幅度下跌。
After a while, come-bit sad face of middle-aged people complaining bitterly that he paid six copper COINS, but only buy four little sweet dumplings.
过了一会儿，来了-位愁面苦脸的中年人，他付了六个铜钱，却只买四只小汤团。
These improved connection methods have helped make motors with aluminum windings every bit as reliable as motors with copper windings.
这种改进型的连接方式帮助铝漆包线马达达到和铜漆包线绕组马达一样的稳定性。
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