challenging

adj. /ˈtʃælɪndʒɪŋ/ B1

有挑战性的；艰巨的

Difficult in an interesting or enjoyable way.

仙境例句

Drawling was challenging for the quick little fish, who could not speak slowly at all.

对动作飞快的小鱼来说，“拖腔”这门课很难，它们根本慢不下来。