"提高英语口语技能" 的英语表达是 "improve Engpsh speaking skills"。
来源："improve" 意思是 "提高"，"Engpsh" 指的是 "英语"，"speaking" 指的是 "口语"，"skills" 指的是 "技能"。
例句：
I need to improve my Engpsh speaking skills before I take the TOEFL exam.
(我需要在参加 TOEFL 考试之前提高我的英语口语技能)
She is taking a class to improve her Engpsh speaking skills.
(她正在上课学习提高她的英语口语技能)
He is going to spend the summer in England to improve his Engpsh speaking skills.
(他打算在英国度过暑假来提高他的英语口语技能)