This likely implies that most Americans either a think our energy needs in future years will be easily satisfied or b are scared of the potentially harmful environmental effects of nuclear energy.
这可能暗示a大部分美国人认为未来需要的能量很容易得到满足。b他们害怕核能可能对环境造成的影响。
Article 4 The unexpected harmful forest biological events are divided into class a and class b.
第四条突发林业有害生物事件分为一级和二级。
The result showed that the UV-B radiation was very harmful to rotifers and could make acute lethal effect on them when the UV-B radiation intensity achieved some threshold.
结果表明：UV - B辐射对轮虫有较大的伤害作用，且当辐射强度达一定阈值会对其产生急性致死作用。
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