For the plane wave of laser without pulse shape, we derive the express of electron trajectory by the relative Lorentz and energy equations. Note that the orbit of electron becomes a " fat-8 " in the average rest frame. 对于无脉冲形状的激光平面波是从考虑了相对论效应的Lorentz方程和能量方程出发,得到了电子的运动轨迹方程表达式,在纵向平均速度参照系下该电子的轨迹呈现8字形;
However, energy analysts say that investment in Africa has failed to take note of basic research needed. 然而,能源分析人员说:在非洲的这些投资并没有关注所需要的基础研究。
' We believe that the current energy crisis may be coming to a head, as a lack of adequate supply growth is becoming apparent, 'Goldman Sachs said in a note to clients. 高盛在发给客户的一份报告中表示,该行认为眼下的能源危机或许正在走向顶点,因供应增速不足的问题正变得更加明显。