心情愉快可以用英文表达为'happy mood'或者'pleasant feeling'。下面是一篇关于心情愉快的文章：

As I woke up this morning, I felt a happy mood wash over me. The sun was shining, and the birds were singing outside my window. I couldn't help but feel grateful for the beautiful day ahead.

As I went about my day, I found myself enjoying the little things. A good cup of coffee, a friendly chat with a colleague, and the feeling of accomplishment after finishing a task all contributed to my pleasant feeling.

Even when things didn't go according to plan, I was able to maintain my happy mood. I reminded myself that setbacks are a natural part of life, and that I have the strength to overcome them.

As the day drew to a close, I reflected on all the good things that had happened. I felt a sense of contentment and peace, knowing that I had made the most of my day.

In conclusion, a happy mood is a powerful thing. It can help us appreciate the present moment, overcome challenges, and find joy in the everyday. So, let's strive to cultivate a pleasant feeling and spread positivity wherever we go.