非化学计量的缺陷常常出现在过渡金属的化合物中。
Non-stoichiometric defects often occur in transition-metal compounds.
先前的研究已经表明这种缺陷会在特定环境中被某些化学物质诱发。
Previous studies have suggested it could be caused by chemicals in the environment.
空气中的铅、食品中的汞和其它化学品可造成长期并且通常不可逆转的结果，例如不孕症、流产和出生缺陷。
Lead in air, mercury in food and other chemicals can result in long-term, often irreversible effects, such as infertility, miscarriage, and birth defects.
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