| 1 | The smog is so thick that you'd better wear a respirator. | |
| 2 | Do you think haze is caused by heat? | |
| 3 | It's severely polluted, there is a great deal of smog in the atmosphere. | |
| 4 | In China, electric bicycles are leaving cars in the dust. | |
| 5 | The camels rolled in the white dust, raising puffs of cloud. |
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