have difficulties （in）doing 和 have difficulty （in）doing 有什么区

have difficulties/difficulty in doing sth? have difficulty in doing sth have trouble doing和have difficulty in doing有区别吗? have difficulty还是difficultyies （in）doing sth? have difficulty in doing sth .have trouble in doing sth 关于have difficulty in doing sth 变形 用have difficulty in doing sth 造句 have a difficulty in doing something have a difficulty (in)doing something有没有这种表示? have some difficulty (in) doing sth.中的 difficulty可数吗 have difficulty doing sth 还是have difficulties do have problem in doing和have problems in doing有什么区别