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DAY 9
| Term | Definition |
|---|---|
| Before determining how many hours a day to spend on language learning, it's [[thiết yếu]] to set clear goals. | essential |
| Air is [[thiết yếu]] for breathing. | essential |
| These gases can cause health problems such as [[hen suyễn]] and lung diseases. | asthma |
| Another important issue is the loss of [[sự đa dạng sinh học]]. | biodiversity |
| Overpopulation, [[công nghiệp hóa]], and urbanization increase the demand for natural resources. | industrialization |
| Overpopulation, industrialization, and [[đô thị hóa]] increase the demand for natural resources. | urbanization |