difficult
adj. /ˈdɪfɪkəlt/ A1
困难的；费力的
Not easy to do, understand, or deal with.
仙境例句
Drawling was a difficult lesson, but the old eel made it look easy.
“拖腔”是一门很难的课，可老鳗鱼做起来却显得轻轻松松。
原著这一句
Alice remained looking thoughtfully at the mushroom for a minute, trying to make out which were the two sides of it; and as it was perfectly round, she found this a very difficult question.
爱丽丝若有所思地打量了蘑菇一分钟，试图弄清哪是它的两边；可由于蘑菇圆溜溜的，她发现这实在是一个极难的问题。
卡罗尔原著 · 第 5 章