Spirocyclane
螺环烷(专指：螺戊烷)
🗣️ 情景例句
Oh dear! What a pity!
啊！真遗憾！
Once an opportunity slips away, it is gone for good.
机会一旦错过，永远不会再来。
who is which depending on whether the customer's account is in credit or is overdrawn.
究竟谁是债务人谁是债权人，要看储户的账户是有结余还是透支。