Translation:The park is near their school.
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That's not correct! The Chinese statement says: The park is near their school. The statement implies that the speaker is talking about an already mentioned park, and now he/she is determining the park's location. Whereas your statement implies that the speaker is mentioning about a park for the first time, and that its location is not the main focus of the sentence but its existence whereas in the Chinese sentence it's the park's location that's the main focus. Your sentence is best translated as: 在他們的學校附近有公園。