Scientists who study past climate, called paleoclimatologists, use core samples of ice retrieved from glaciers to study the annual accumulation patterns over thousands of years. Air bubbles trapped in the ice and other clues, such as dust particles, can help us reconstruct past climate.
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Small objects such as dust particles and water droplets fall only small distances before losing most of their acceleration.
向尘埃和小水滴这种小物体只下降很短距离就失去它们的大部分加速度。
In this case mold feeds itself by dust, airborne particles such as pollen, and so on.
在这种情况下，霉菌靠空气中的微粒、灰尘为生，例如花粉等等。
The main factors: the dust resistance, the concentration of dust, particles of dust, gas composition, temperature, humidity, air leakage, such as the collecting.
其影响因素主要有：粉尘的比电阻，含尘浓度，粉尘颗粒组成，气体成分，温度，湿度，收尘的漏风等。
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