Last week, the Trump administration said it is loosening restrictions on air toxins from mercury, lead and other heavy metals that are released by coal plants. Such pollution is known to be neurotoxic and has been linked to irreversible brain damage in children and infants, as well as heart disease and cancer in adults.
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def close(self) - None:，更多细节参见同城约会
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* 核心功能：每次调用next(val)，返回当前价格的跨度（往回数≤当前价格的最大连续天数）