嘛 (ma): Modal Particle cho thấy rằng sth là hiển nhiên

Don't worry, Xiao Li—he can definitely help you solve this problem.

Learning Chinese—just listen and speak more, and you'll naturally get it; there's nothing to be afraid of.

It's Sunday—of course the park is crowded; let's go another day.

He's the manager—naturally he's responsible for the decisions of the whole department.

Kids—it's normal for them to make small mistakes; just teach him patiently.