I at once fell in love with it.

我立刻爱上了它。

youdao

I once fell in love with someone. I couldn't stop wondering if she loved me back.

我曾经爱上一个人，我想知道她到底喜不喜欢我。

youdao

A lion once fell in love with a beautiful girl, so he went to her parents and asked them to marry her to him.

一只狮子爱上了一位美丽的女孩儿，便找到她的父母向她求婚。

youdao

But once I saw the heart of the city, I fell in love with it.

但当我看到市中心的那一刻，我就爱上了这座城市。

对纽约的印象 - SpeakingMax英语口语达人