Defease
vt. 使作废，废除(合同、契约等)：
🗣️ 情景例句
Hello, Air China Flight Reservations. May I help you?
喂，你好，中国航空公司订票处，需要帮忙吗？
Ah, goody! Breakfast is ready.
噢，太好了！可以开饭了！
Jim is writing. Lily isn't writing. She's looking at the blackboard.
吉姆在写字。莉莉没在写字。她在看黑板。