【Key words】 Lake Barkol； grain-size； empirical orthogonal function； Holocene； effective moisture； dust activity；
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Faced with any situation that can't be solved by the sheer force of activity, they generate a dust cloud of impatience.
面对任何单凭行动的力量无法解决的情况，他们会产生不耐烦的情绪。
Of course, solar activity is just one natural source of climate variability. Volcanic eruptions are another, spewing gas and dust into the atmosphere.
当然，太阳活动仅仅是气候变化的一个自然因素，火山喷发出气体和尘埃进入大气层也会带来这个结果。
Although they are a natural phenomenon, dust storms have been occurring more often, at shorter intervals, and with greater force in recent years, and human activity is the cause.
沙尘暴虽是自然现象，但是近年来发生的频率却逐渐增加，间隔的时间也愈来愈短，破坏力更强大了，人的活动是罪魁祸首。
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