If something burgeons, it grows or develops quickly. The old picture behind the word is a bud pushing out into a shoot. People still sometimes use it of plants after rain, but today it is more often a picture-word for things that are not plants: a small shop that burgeons into a chain, a city that burgeons as people move in, an interest that burgeons overnight. You will very often see burgeoning in front of a noun: a burgeoning film industry, a burgeoning love of cooking. It is not a street word; it sounds a little bookish, the kind of word a newspaper or a teacher might choose. It almost always suggests lively, fast growth, not something slow and careful.

蓬勃發展；急速成長（植物也可說萌芽）