| 1 | Nitrogen has the highest proportion in the Earth's atmosphere, reaching 78%. | |
| 2 | In chemistry, specific gravity refers to the mass of a substance per unit volume under standard conditions. | |
| 3 | Cheese accounts for a large proportion in making pizza, so it is important to control the amount added. | |
| 4 | Steel accounts for a large proportion in infrastructural projects such as construction and railways. | |
| 5 | Compared with other vehicle models, hybrid cars have a higher proportion of electric motors, which can significantly reduce exhaust emissions. |
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