Indoor pollution, which includes sources like home heating and cooking, has remained constant over the past several decades despite advances in the area.
在过去几十年中，来源于诸如家庭供暖和烹饪等的室内污染持续存在，尽管在这方面已经有所改进。
Moreover, during the past two decades, China has used pollution charges and other measures to keep both air and water pollution levels constant even as economic output has doubled.
中国在过去20年利用污染收费制和其他措施，在经济产出增长一倍的情况下使空气和水污染问题没有进一步恶化。
They make a constant din and cause acute pollution.
这些摩托车喧嚣不断，还会造成严重污染。
Since the device is sealed in the constant pressure water supply, Entirely keep the water quality sanitation tagging, Because do not contact with air, Avoid secondary pollution and vandalism.
由于该设备是密闭的恒压供水，完全保持了水源的水质卫生标注，由于不与空气接触，避免二次污染和人为破坏。
It is found that the carbonization velocity coefficient will not be constant but increased with the elevation of CO2 concentrations resulted from the air pollution.
分析发现，随着大气中CO2浓度的升高，混凝土碳化速度系数不再是一个恒定的量，而是随时间延长不断增大，表明大气污染会加剧混凝土的碳化。
It is found that the carbonization velocity coefficient will not be constant but increased with the elevation of CO2 concentrations resulted from the air pollution.
分析发现，随着大气中CO2浓度的升高，混凝土碳化速度系数不再是一个恒定的量，而是随时间延长不断增大，表明大气污染会加剧混凝土的碳化。
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