A "loud sigh" means she thinks you are an idiot at that moment, and wonders why she is wasting her time standing here arguing with you over "Nothing".

一声“大声叹息”意味着她认为那一刻的你是一个白痴，而且不明白自己为什么浪费了这么多时间站在这里来跟你争论“无关紧要的事”。

youdao

What a thankless child you are, just idle and good-for-nothing!

你真是个不知好歹的孩子，整天游手好闲，一无是处！

youdao

Pretending he had seen nothing, he asked with a smile, "How are you, my dear Lamp-Wick?"

他假装什么也没看见，微笑着问：“你好吗，我亲爱的蜡烛芯？”

youdao

Then you are looking at a land like nothing else in the world.

VOA: special.2009.10.07

But if you are already a millionaire, you have nothing to worry about.

FORBES: Connect

In contrast, when you are a startup executive, nothing happens unless you make it happen.

FORBES: 7 Reasons Big-Company Executives Fail in a Startup

If your message contains nothing but problems, you are nothing but a complainer.

FORBES: What Is Your Problem? -Media Training