用二阶微拢论计算这一截面，结果表示为核矩阵元和激光电场强度的函数。
The cross sections for such processes are calculated in second order perturbation theory and expressed in term of the intensity of laser radiation and the nuclearmatrix elements.
为了显示中央转轴的转动，曾有实验将一截短的荧光标记的微丝连于其上。
To show the rotation of the central shaft, a short fluorescent actin filament was experimentally attached to it.
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