Vietnamese
For absolute beginners
Không gian
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Vocabulary
Ngôi sao
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Hành tinh
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Thiên hà
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Tiểu hành tinh
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Hố đen
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Trạm vũ trụ
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Vệ tinh
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Vũ trụ
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Sao chổi
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Tên lửa
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