undertaking

n. /ˌʌndərˈteɪkɪŋ/ B2

艰巨任务；事业；承诺

A formal pledge or a difficult, important task.

仙境例句

Telling a whole story without falling asleep was a great undertaking for the Dormouse.

讲完一整个故事而不睡着，对睡鼠来说是一项艰巨的任务。