Cách sử dụng
The expression "touch upon" means to briefly mention or talk about a subject without going into great detail. It is often used in casual conversations, presentations, and written works to give a brief overview of a topic or to introduce a subject that will be discussed in more detail later. For example, in a conversation about travel, someone might say, "Let's briefly touch upon the topic of safety when traveling." This means they want to mention safety, but they do not want to go into much detail about it at that moment.