They may use a credit card for convenience.

他们可以为了方便而使用信用卡。

《柯林斯英汉双解大词典》

Visitors may use the swimming pool between 7 a.m. and 7 p.m.

访客从早上7:00到下午7:00可在游泳池游泳。

《牛津词典》

While they may use a credit card for convenience, affluent people never let interest charges accrue.

虽然有钱人可能为了方便而使用信用卡，他们从来不让利息费累积。

《柯林斯英汉双解大词典》

A teacher may use it when she walks into a room where the students are playing and talking, instead of studying.

VOA: special.2009.01.11

since he is born with weapons for the use of wisdom and virtue, he may use them for the opposite ends.

人生下来就有可以运用智慧和美德的利器,但人也可以用这利器反其道行之

耶鲁公开课 - 古希腊历史简介课程节选

Like I mentioned, you can also use "I want to" to ask if you may do something indirectly.

就像我之前说的，你可以用“I want to”句型间接地询问你是否可以做某些事。

I want to 课堂 - SpeakingMax英语口语达人

They may use this information to provide you with interest-based (behavioral) advertising or other targeted content.

NEWSWEEK: Privacy Policy

Men may only use their right hand to swing the mallet, while women may use both hands.

BBC: Polo-playing elephants in Nepal

The IRS may use this decision as a weapon against personal service C corporations.

FORBES: Seventh Circuit Surprised To See Accounting Firm "Screw Up Its Taxes"