他思绪万千。

His mind kept turning in an endless loop.

她思绪万千，脑子里乱作一团。

So many thoughts whirled around in her mind.

所有新事物都让我眼花缭乱，思绪万千。

I was overwhelmed with all the new things to observe and take into account.

Nick坐在他的公寓中，思绪万千。

Nick sits in his apartment, his mind racing.

我能参加这样的盛会，真是百感交集，思绪万千。

That I have been able to attend a grand meeting such as this one, fills my mind with a myriad of thoughts and ideas.