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The numbers behind the chinese word indicate the tones that a Mandarin speaker would use. If you like, you can leave it out. Non-chinese readers won't care about the tones, and Chinese readers should be able to guess the term that you mean based on the context of the story.
Yes but if you have a word like Mah. It would mean Mom, Mother, Horse, or argue. Depending on the tone of voice and the number of times you repeat. You wouldn't want to call your mother a horse would you goofy ?

MA MA = Mother (this tone is of voice is said like as if you dropped something on your toe wink )
MA = Mom
Ma? = Horse
May (with heavy tone) = argues

My dad says that Angel in Chinese is pronounced "Tan S-eu-z" or "Tan Sz". If you don't want to get too complicated.