以下为句子列表：
英文: But how the “greenhouse effect” operates and why such a tiny proportion of CO2 has such a harmful effect are still the two most puzzling questions haunting natural scientists today.
中文: 但是，温室效应怎样起作用，如此少量的二氧化碳为什么会具有如此有害的效应，仍然是两个最令自然科学家魂牵梦绕迷惑不解的问题。
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英文: In order to reduce the harmful effect of trace elements on casting quality, it is necessary to intensify control over the charge materials.
中文: 为减少微量元素对铸件质量的不利影响应加强对炉料的控制。
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