坐在一個暗角落裡我觀察到他的嘴慢慢而逐漸地伸長英文怎麼說？

As I sat in a shadowy corner, I observed a slow and gradual elongation of his mouth.

那孩子漸漸領悟到音樂的樂趣英文怎麼說？

The child had a gradual awakening to the joys of music.

這種一點一點漸進的改變受到大多數人的歡迎英文怎麼說？

The gradual and piecemeal change was welcomed by most people.

這是一個逐漸發展的過程英文怎麼說？

It's a process of gradual development.