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Generally speaking, stomach sleepers need more support from their mattress to keep their abdomen from caving into the mattress and creating an arch in their back, which contributes to back pain. Back sleepers require good lumbar support. Side sleepers should prioritize pressure relief in addition to spinal alignment.
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接下来是“拍照”，用高能电子束照射样本。由于电子的波长只有可见光的几千分之一，其成像精度可达原子级别。配合高灵敏度的直接电子探测器（类似于数码相机中的图像传感器CCD），可以精准捕捉穿过样本的电子信号，生成大量清晰的二维投影图像。
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