Affecting nonchalance, I handed her two hundred dollar bills.

我假装若无其事地递给她两张百元钞票。

《柯林斯英汉双解大词典》

She was very tense, but she preserved an appearance of nonchalance.

她内心很紧张，可外表却装着满不在乎的样子。

《新英汉大辞典》

His eyes, blue as the summer sky, gave away his fierce devotion to his friends, even when he tried to feign nonchalance.

他的眼眸蓝如夏日晴空，泄露了他对朋友们的深情厚意，尽管有时他试图装出一副冷淡的样子。

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Notice Thomas's really superb nonchalance and offhandedness and simplicity. "It was late June." "The steam hissed."

注意托马斯绝好的冷淡随意和简单,“那是六月下旬“，“蒸气咝咝“

耶鲁公开课 - 现代诗歌课程节选

But still with some resemblance of nonchalance I asked, ?" "how different?"

不过我还是漫不经心地问，“有何不同“

哈佛公开课 - 幸福课课程节选

At PS1, the audience was delighted to see the band, and there was less feigned nonchalance.

NEWYORKER: Atomic Clock

The opposite of Apple's long-ago aspirational epic, Samsung's nonchalance also skewers BlackBerry's earnest deflection.

ENGADGET: Editorial: BlackBerry slumps into history of Super Bowl tech ads

Years from now, I suspect that obesity interventions will be viewed with the same nonchalance.

FORBES: The Fat Lady's Soda Song: Sugary Beverages Cause Obesity