Vietnamese
For absolute beginners
Môi trường
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Vocabulary
Ô nhiễm
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Tái chế
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Khí hậu
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Phá rừng
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Ôzôn
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Tái tạo
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Hệ sinh thái
Your browser does not support the audio element.
Môi trường sống
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Đa dạng sinh học
Your browser does not support the audio element.
Bảo tồn
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