Backdoor
a. 秘密的
✅ 同义词
🗣️ 情景例句
An apple a day keeps the doctor away.
每天一个苹果不用看医生。
Kindness is the golden chain by which society is bound together.
善良是连结社会的金链。
Mr.Hart has trained his daughter for years.
哈特先生训练她的女儿已经多年了，