A larger and heavier aircraft must displace more air and create more lift to sustain flight, compared with small, light aircraft.
较大的重型飞机比较小的轻型飞机要移动更多的空气、制造更大的提升力以支持飞行。
During this process, grains of different densities will displace relatively, with the heavy materials bring delivered into lower layer and the light material being transferred into the upper layer.
在这一过程中，密度不同的颗粒发生相对转移，重矿物进入下层，轻矿物转入上层，分别排出后即得精矿和尾矿。
So it is suitable for precise measurement of light signal and those that can invert into light signals indirectly, such as position, distance, displace, angle and other relevant physical variables.
可适用于对光信号或是能够间接转化成光信号的物理量，如位置、距离、位移、角度等进行精确测量。
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