Have you ever been so focused on something that nothing else around you seems to matter? That's called attention, and when we're really focused on something, we call it "suspended attention."
Now imagine if you could hold that focus for a long time, without getting tired or distracted. That's what "evenly-suspended attention" is all about. It's a state of mind where we can concentrate on something without any break or distraction.
Think of it like sitting in a very peaceful place, where your mind is calm and focused. You can concentrate on one thing, like a beautiful flower or a painting, for a long time without worrying about anything else. That's what it's like to have evenly-suspended attention.
Some people practice things like meditation or yoga to help achieve this state of mind. It can help them feel more calm and focused in their daily lives. It's not always easy to achieve, but with practice, anyone can learn how to have evenly-suspended attention.