Nonbiodegradable pollutants, such as certain chlorinated hydrocarbon pesticides (e.g.DDT) and heavy metals, such as lead, copper, and zinc in some industrial effluents, accumulate in the environment.
生物不可降解的污
,
代烃类杀虫剂(
DDT)和工业废水中的重金属,
铅、铜和锌,在环境中积累。
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Even before World War Two, scientists had known about the potential energy inside uranium, the heaviest metal in the periodic table a diagram which groups the chemical elements into rows and columns according to their atomic number and symbol.
甚至在第二次世界大战之前,科学家们就已经知道铀内部的势
。铀是元素周期表中最重的金属,元素周期表是根据原子序数和原子符号将化学元素分成行和列的图表。