difficulty的形容詞是？

　　例句：

　　Do you have difficulty getting up?

　　你起床有困難嗎？

　　They discussed the difficulty of studying abroad.

　　他們討論了到國(guó)外學(xué)習(xí)的困難。

　　Teenagers often have difficulty expressing themselves.

　　十來歲的孩子在表達(dá)思想方面常常有困難。