In order to extend the cut-off energy, we use ions as the medium of interactio
n is a promising method, and the ionization energy of ions is higher than atom
s, and it requires strong laser pulses to ionize, resulting in higher ponderom
otive potential.
我的老师说有两个动词的文法问题,可是我看不出来,有英文很好的大大可以帮忙解惑吗