airmailing vs. mailing：

• airmailing：特指通過飛機寄送郵件，強調速度和國際傳遞。
• mailing：一般指任何形式的郵寄，包括地面和航空，不特別強調傳遞方式。

Airmailing is the process of sending letters and packages via airplanes to ensure quick and efficient delivery. 

1. 原形：I need to airmail this document to New York.
   中文：我需要將這份文件通過航空郵件寄到紐約。
2. 過去式：She airmailed the package yesterday.
   中文：她昨天寄出了這個包裹。
3. 過去分詞：The letter was airmailed to ensure it arrived on time.
   中文：這封信通過航空郵件寄出，以確保它按時到達。
4. 現在分詞：He is airmailing the invitation to his friends overseas.
   中文：他正在將邀請函通過航空郵件寄給海外的朋友。
5. 第三人稱單數：She airmails important documents to her clients.
   中文：她通過航空郵件將重要文件寄給客戶。

Airmailing is the process of sending letters and packages via airplanes to ensure quick and efficient delivery. This method is often used for international mail due to its speed compared to ground transportation. When airmailing, senders usually affix a special airmail sticker or stamp to the items, indicating the preferred method of transportation. The act of airmailing involves multiple steps, including preparing the mail, labeling it appropriately, and delivering it to an airmail processing center.