I tried to reassure her, "Don't worry about it. We won't let it happen again."

我尽力使她安心，“别担心，我们不会允许它再发生的。”

《柯林斯英汉双解大词典》

It meant don't worry about it.

它表示“不要为此担心”的意思。

youdao

If you're a student who chooses to study while sitting at a table in a busy shopping center, don't worry about it.

如果你是一名选择坐在繁忙的购物中心的桌子旁学习的学生，不要担心。

youdao

"Hopefully,they get it capped off and we don't have to worry about it over here.

VOA: standard.2010.05.17

But don't worry about it, it's not, I'm just using it because it's a simpler example than the one I really want to get to, which is knapsack.

但是别担心，我讲这些是因为它比我,真正想讲的问题简单一些，我想讲的是背包问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's okay. Don't worry about it. We'll even take care of this for you."

但主任说），“没关系的，别担心，我们会帮你处理的。”

在学校的时光 - SpeakingMax英语口语达人

" Clinton joked that at least one of her counterparts said, "Don't worry about it.

CNN: The Sweep: WikiLeaks stirs anarchy online

Although I don't worry about it anymore, whenever I'm asked, it reminds me that I'm still grumpy.

BBC: Sir Peter Blake on his Brit design

"Andy you're too good a player not win a grand slam, so don't worry about it, " he said.

CNN: Magical Federer claims Australian Open title