Stunning sunset --- 令人驚嘆的日落

原文

這是一個平凡的日子,天氣很舒服,我突然瞥見日落時,粉紅色的天空,上前一看,
天空中居然出現了彩虹,太棒了! 這種美景,我從未見過,尤其在公寓的陽台前,這是城市裡完美的邂逅:)

It was just an ordinary day with comfortable weather when suddenly, I glanced over to see the sunset with a pink sky! I really enjoyed looking at the sunset. There was a rainbow showing in the sky and it was amazing! I've never seen this sort of scene before, especially from the front balcony of my apartment. This was a perfect experience for me in the city. :) 

Stunning sunset --- 令人驚嘆的日落

原文

這是一個平凡的日子,天氣很舒服,我突然瞥見日落時,粉紅色的天空,上前一看,
天空中居然出現了彩虹,太棒了! 這種美景,我從未見過,尤其在公寓的陽台前,這是城市裡完美的邂逅:)

From your original Chinese,

It was an ordinary day and I was feeling very comfortable in this weather.  Suddenly I happened to glance at the pinkish sunset sky.  On a closer look, a rainbow had appeared.  Wow!  I have never seen such a lovely scene before, especially from the balcony of my apartment. A perfect encounter in the city.

It was just a ordinary day with comfortable weather.I glanced at sunset in the pink sky,then I looked toward to it. There was a rainbow show on the sky,amazing ! I have never seen the scene before,especially in front of the balcony of my apartment. This is a perfect encounter between me and the city. :)

Stunning sunset

It was just a ordinary day with pleasant weather. I glanced at the sunset in the pink sky, then I looked at it again - there was a rainbow! It was amazing! I have never seen such a scene before, especially not from the balcony of my apartment. This was a perfect encounter between me and the city. :) 

What a wonderful photo, Sonia! I'm going to use it as the wallpaper image on my phone!

Stunning sunset --- 令人驚嘆的日落

原文

這是一個平凡的日子,天氣很舒服,我突然瞥見日落時,粉紅色的天空,上前一看,
天空中居然出現了彩虹,太棒了! 這種美景,我從未見過,尤其在公寓的陽台前,這是城市裡完美的邂逅:)

It was just a ordinary day with comfortable weather.I glanced at sunset in the pink sky,then I looked toward to it. There was a rainbow show on the sky,amazing ! I have never seen the scene before,especially in front of the balcony of my apartment. This is a perfect encounter between me and the city. :)

It was just a ordinary day with comfortable weather.I glanced at the sunset in the pink sky. There was a rainbow in the sky. Amazing ! I have never seen this scene before,especially in the balcony in the front of my apartment.

correction fr AC

Stunning sunset --- 令人驚嘆的日落

原文

這是一個平凡的日子,天氣很舒服,我突然瞥見日落時,粉紅色的天空,上前一看,
天空中居然出現了彩虹,太棒了! 這種美景,我從未見過,尤其在公寓的陽台前,這是城市裡完美的邂逅:)

It was just a ordinary day with comfortable weather.I glanced at sunset in the pink sky,then I looked toward to it. There was a rainbow show on the sky,amazing ! I have never seen the scene before,especially in front of the balcony of my apartment. This is a perfect encounter between me and the city. :)

It was just a ordinary day with comfortable weather. I glanced at sunset in the pink sky, then I looked toward to it. There I saw a rainbow, it was amazing. I had never seen this scene before, I definitely would not expect it from the front balcony of my apartment. It was a perfect encounter between me and nature.

correction from 司馬修