The laser trap can keep a tiny spherical sample - measuring only a millimeter across - levitated so experiments can be done.
激光阱能使一个直径仅1毫米的微小的球形样品保持悬浮，这样就可以做实验了。
The laser trap can keep a tiny spherical sample — measuring only a millimeter across — levitated so experiments can be done.
激光阱能使一个直径仅1毫米的微小的球形样品保持悬浮，这样就可以做实验了。
By the calculation it is found that the decreasing radius is all the same for different particle radius at per unit time when the spherical sample particle is evaporated.
本文在计算恒温下蒸发球形试样粒子时，发现每单位时间蒸发缩小的半径相等。
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