许可透支的英文：
Opt-in overdraw

He has opted out of the bank.
他已决定自银行辞去工作。

What courses are most students opting for?
多数学生选什么课程？

The scientists will opt for the recursive descendent method.
科学家们会选择递归下降法。

He opted to go to Paris rather than London.
他决定去巴黎，不去伦敦。

To opt out at the critical moment would be quite indefensible.
在关键时刻置身事外的做法是决不不能原谅的。

Then,how much can I overdraw from my personal ordinary card?
那么我的这张普通卡能透支多少钱呢？