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词汇 refractory
例句 Some ores are more refractory than others.一些矿石较另一些矿石要难熔炼。After recovery they were refractory to infection.病愈之后,他们便不易受感染了。He suffered from a refractory cough.他得了一种咳嗽顽疾。Tungsten is the most refractory of metals.钨是最难熔的金属。
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