daunting

Learning a completely new language with a different alphabet can be a daunting challenge.

(Chinese) 学习一种带有不同字母系统的全新语言可能是一项艰巨的挑战。

She faced the daunting task of organizing the international conference with no help from her staff.

(Chinese) 在没有员工帮助的情况下，她面临着组织国际会议的艰巨任务。