在苍白的肤色映衬下，乔安脸上的雀斑一下子更明显了。

The freckles on Joanne's face suddenly stood out darkly against her pale skin.

《柯林斯英汉双解大词典》

在讨论现代有影响的艺术家时，一下子有三个名字出现在脑海中。

When discussing influential modern artists, three names immediately come to mind.

《牛津词典》

我昨天看到他了。我猛地一下子意识到我仍然在爱着他。

I saw him yesterday and—wham!—I realized I was still in love with him.

《牛津词典》

This is discussed in detail in the textbook Don't panic if you don't get it quite now.

这在教材中已有详细的叙述,如果一下子理解不了也不用担心。

耶鲁公开课 - 心理学导论课程节选