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| 51. | (b)force or substance that produces an effect or change |
| 产生某种效果或变化的力量或物质;动因;作用物;剂 |
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| 52. | magnet : Any material capable of attracting iron and producing a magnetic field outside itself. |
| 磁体: 能在其外部产生磁场并吸引铁的任何物质 |
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| 53. | The substance or quantity of a substance produced by a melting process. |
| 熔解量一熔解过程所产生之物质或其质量 |
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| 54. | However, nuclear reactors generate100 grams of the substance worldwide each year. |
| 然而，每年全球各地的核反应堆都会产生100克左右这样的物质。 |
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| 55. | Any material, liquid or solid, consumed in the production of the gaseous jet is termed a propellant . |
| 用于产生喷气的任何液体或固体物质均被称为推进剂。 |
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| 56. | Some materials produced by the body are, of course, toxic if accumulated in too large amounts. |
| 当然身体中产生的某些物质如果积蓄量太大了，就会有毒性。 |
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| 57. | a substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck. |
| 加热或碰撞后会发生急速化学变化（并产生气体）的物质。 |
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| 58. | This appliance can cause low-level exposure to some of the substances listed, including formaldehyde. |
| 这种电器可能会导致产生低含量的有些清单物质，包括甲醛。 |
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| 59. | Physical substance; matter. |
| 实体物质；物质 |
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| 60. | An aromatic substance, such as wood or a gum, that is burned to produce a pleasant odor. |
| 香燃烧时产生好闻气味的芳香物质，如树木或树胶 |
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