I'll take just a cup for luck.

为讨个吉利我就喝一杯。

《新英汉大辞典》

Environment: a washing machine USES thousands of nylon beads, and just a cup of water, to provide a greener way to do the laundry.

环境：一种需要用成千的尼龙水珠和仅仅一杯水的洗衣机，它(给我们)提供了一种更加绿色的洗衣方式。

youdao

You just press the button and, hey presto, a perfect cup of coffee!

只要按下按钮，嘿，马上就出来一杯上好的咖啡！

《牛津词典》

It is not normal to have just a smooth, easy ride through a World Cup qualifying.

VOA: standard.2009.06.07

Let's just say it's the Kellogg's Frosted Flakes and three quarters of a cup is about how much you had, and so these serving sizes are listed here.

假设这里就是家乐氏香甜玉米片,你大概吃了四分之三杯,这里同时列出了每份的量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

or there's having tea, just you know, get up in the morning, a cup of tea.

或者，早晨起床后，喝一杯茶。

来一杯红茶怎么样？ - SpeakingMax英语口语达人

Of course, finding the rhythm in Vienna can also mean a quiet stroll through the Baroque streets at night, a meander along the banks of the Danube or just stirring a cup of coffee in a cafe.

BBC: Finding your rhythm in Vienna

Thanks to this new breed of coffee bars, those looking for a serious coffee education, or just a great cup, have more choice than ever before.

BBC: A speciality coffee scene brews in Hong Kong

One Cofetel official said she felt like Mexico had just won a World Cup soccer game.

WSJ: Rare Headwinds in Mexico Buffet Slim