理解不了用英语怎么说？

理解不了

例句

• The poem is so complicated that I cannot make out its meaning. 这首诗太复杂, 我理解不了它的意思。
• How ostriches could bear to run so hard in this heat I never succeed in understanding. 驼鸟在这样干燥炎热的地带为什么能疾速长跑,我永远也理解不了.
• They can neither read nor write, nor can they comprehend such concepts. 他们不会读，不会写，也理解不了这样的概念。
• The professor's abstrusely reasoned theories were wasted on his students. 学生理解不了这位教授的深奥难懂的理论.