physical meaning短语¹⁴⁴⁹⁷²⁺² 基本例句 物理意义 The second-order moment radius of the focal spot depending on intensity distribution and phase distribution of near field is derived, and its clear physical meaning is described. 结果表明：畸变光束的焦斑二阶矩角半径由光束近场波前相位梯度的强度加权均方根值和对数强度梯度的强度加权均方根值决定。 www.hplpb.com.cn