Lacking knowledge or understanding about something; uninformed

• Unable to grasp what is happening; out of one's depth

对某事缺乏知识或理解；不知情的

• 难以明白正在发生的事；无所适从的

Giving no clues or hints to solve a problem

• Offering no guidance, leaving one at a loss

不给出任何线索或提示，难以解决问题

• 没有指引，让人茫然无措