以下为句子列表：
英文: To achieve this temperature, the atoms must be isolated in a vacuum cell, suspended in free space by magnetic fields, and chilled by laser cooling and another technique called evaporative cooling [see box on page 51].
中文: 要达此温度，原子必须隔离在真空腔里，利用磁场而漂浮在真空中，并以雷射冷却法或另一种称为蒸发冷却的技术来降温（参见87页〈降温大法〉）。
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