Backdoor
a. 秘密的
✅ 同义词
🗣️ 情景例句
Unless in uniform, he doesn't look like a policeman.
除非穿上制服，要不他看起来不像警察。
What's this?
这是什么？
It obviously could not tell the difference between Indian music and jazz!
显然，它分辨不出印度音乐和爵士乐！