The caller asked for account details under the guise of a bank security officer.

來電者假冒銀行資安人員,要求提供帳戶資料。

Some vendors raise prices under the guise of covering higher shipping costs.

有些供應商以運費上漲為幌子來調高價格。

He attended the competitor's trade show in the guise of an ordinary visitor.

他偽裝成一般參觀者,出席競爭對手的商展。