principal office的用法和樣例：
例句
- You'll have to complain to Head Office if the washing machine stops working again.
如果洗衣機又停止運轉，你得向總店申訴。 - He was sent to our central office to take over the new sales department.
他被分配到我們的總店去接管一個新的銷售部門。 - We've got to report back to the head office.
我們還要回去向總部彙報情況呢。 - You must represent your complaints to Head Office.
你必須向總部表示出你的抱怨。
