困难 /kʰuən˧˥ nan˧˥/ NounEnglishdifficultyPortuguêsdificuldadeExample他**费了九牛二虎之力**才找到恰当的措辞。He had difficulty finding the right words.此处用成语“费了九牛二虎之力”来描绘克服困难的过程,比直译更生动。