Backdoor
a. 秘密的
✅ 同义词
🗣️ 情景例句
Never gamble if you can't afford to lose.
如果你输不起的话，永远不要赌博。
It's already in production, so you can expect it in stores before the end of the month.
产品已投产了，所以月底前你可以获得。
At what time can we work out a deal?
我们什么时候洽谈生意？