challenging

US /ˈtʃæl.ɪn.dʒɪŋ/
UK /ˈtʃæl.ɪn.dʒɪŋ/
"challenging" picture
1.

有挑战性的, 艰巨的

testing one's abilities; demanding

:
Learning a new language can be very challenging.
学习一门新语言可能非常具有挑战性
She took on a challenging new role at work.
她在工作中承担了一个具有挑战性的新角色。