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| 41. | Detectable only by microscopic examination or chemical analysis, as a minute blood sample. |
| 通过显微镜观察测知的只能通过显微镜观察或化学分析才能发现的，如微量的血样 |
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| 42. | Another advantage of steam, as contrasted to chemical sterilants, is that a crop can be planted almost |
| 蒸汽比其他化学消毒剂的好处是，消毒后马上就可以种植作物。 |
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| 43. | grog, there are dry process production and wet process production, have already been used such trades as |
| 回转窑是煅烧水泥熟料的主要设备，可分为干法生产和湿法生产，亦已被广泛应用冶金、化工等行业。 |
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| 44. | Polymeric noise reduction composites were widely applied to the fields such as architecture, traffic |
| 降噪高分子材料可广泛应用于建筑、通、工和生活等各个领域。 |
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| 45. | a fine black powder of platinum; used as a catalyst in chemical reactions. |
| 一种黑色的铂的细粉末，在化学反应中用作催化剂。 |
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| 46. | "To remove the color from, as by means of chemical agents or sunlight." |
| 去除颜色,如通过化学药剂或阳光等。 |
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| 47. | Never use abrasive cleansers or chemical solvents, as they may mar the casing. |
| 切勿使用研磨性清洁剂或化学溶剂清洁，以免损坏外壳。 |
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| 48. | The other reason fire gives off light, is as part of the chemical reaction. |
| 火焰发光的另外一个原因是那是化学反应的一部分。 |
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| 49. | luminescence resulting from a chemical reaction as the oxidation of luciferin in fireflies. |
| 由化学反应发出的光，比如萤火虫的虫萤光素发生氧化反应时发出的光。 |
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| 50. | However the same consideration applies to the use of conventional methods of food preservation such as |
| 然而,同样的情况在加热或使用化学防腐剂等其它常规的食物保鲜法中也存在。 |
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