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.
我的老師說有兩個動詞的文法問題,可是我看不出來,有英文很好的大大可以幫忙解惑嗎