Teenagers often have difficulty expressing themselves.

　　十來歲的孩子在表達思想方面常常有困難。

　　They showed great perseverance in the face of difficulty.

　　他們面對困難表現了堅強的毅力。

　　We're having difficulty keeping up our mortgage payments.

　　我們難以繼續償還按揭貸款。

　　Something gave me the strength to overcome the difficulty.

　　有件事給了我克服困難的勇氣。

　　The patient was perceived to have difficulty in breathing.

　　發現病人呼吸困難。