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| 31. | The dusk is gathering. |
| 暮色渐浓。 |
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| 32. | concentrated ointment |
| 软膏浓制品 |
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| 33. | The darkness is gathering. |
| 夜色渐浓. |
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| 34. | a concentration cell |
| 浓差电池 |
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| 35. | apply the mascara thickly |
| 浓施睫毛膏. |
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| 36. | The fog was getting thicker every minute, |
| 雾越来越浓， |
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| 37. | strong/weak coffee |
| 浓/淡咖啡 |
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| 38. | concentrated ammonium liquid |
| 浓氨溶液 |
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| 39. | concentration polarization |
| 浓差极化 |
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| 40. | concentration diffusion |
| 浓差扩散 |
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