Please enclose a self-addressed stamped envelope with your application for faster processing.

請隨申請表附上一個已貼郵票並寫好回郵地址的信封，以加快處理速度。

The invoice arrived in a sealed envelope marked confidential from our accounting department.

這張發票裝在一個標有「機密」字樣的密封信封裡，由我們的會計部門寄來。

Guests will find their room keys in an envelope at the front desk.

房客可以在櫃台的信封裡找到他們的房間鑰匙。