名词
中文翻译：二价
同义词：
['dual', 'two-valent']
例句：
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1. The salt is sold in two-centre packages.
这种盐以两元一包出售。
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2. The two-valent metal has a strong affinity for water.
这种金属对水有很强的亲和力。
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3. In the chemical industry, two-valent iron is used to make ferroalloys.
在化学工业中，二价铁被用来制造合金。