1. The occurrence of something that is encountered frequently is often referred to as a "common phenomenon" in English.2. When describing something that happens often, you can say it is a "frequent occurrence" or a "regular feature."3. If you want to express that something is widespread and happens across various situations, you might say it is a "pervasive phenomenon."4. The term "ubiquitous" can also be used to describe something that is普遍存在于許多地方 or happens constantly.5. For something that is not only common but also generally accepted as normal, you can use the phrase "a normative phenomenon."