n.困难( difficulty的名词复数 )；难度；难事；麻烦 双语释义：n.(名词)[U]困难; 难度 state or quality of being difficult; trouble or effort that sth involves[C]难事; 麻烦 difficult thing to do; a situation or problem that causes trouble英英释义： difficultyn.an effort that is inconvenient"had d