Many new employees are ignorant of the company's travel reimbursement policy at first.

許多新進員工一開始對公司的差旅報銷規定一無所知。

The customer was ignorant of the shipping fees until the invoice arrived by email.

那位顧客直到收到電子郵件寄來的發票，才知道有運費。

Investors who remain ignorant about market risks often make costly financial decisions.

對市場風險一無所知的投資人，常常做出代價高昂的財務決定。