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| 21. | Rest breed rust. |
| 不活动，必生锈。 |
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| 22. | oxidative cleavage |
| 氧化解离|氧化裂化|氧化分解 |
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| 23. | " Method for chemical analysis of yttrium and yttrium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, terbium oxide, dysprosium oxide, holmium oxide,erbium oxide |
| GB/T16480.1-1996金属钇及氧化钇化学分析方法氧化镧、氧化铈、氧化镨、氧化钕、氧化钐、氧化铕、氧化钆、氧化铽、氧化镝、氧化钬、氧化铒、氧化铥、氧化镱和氧化镥量的测定 |
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| 24. | Rub off rust |
| 把锈擦掉 |
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| 25. | "Terbium oxide-Determination of lanthanum oxide, ceriurn oxide, praseodymium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide,holmium oxide, erbium oxide and yttrium oxide contents--Emission spectrographic met" |
| "GB/T12690.11-1990稀土金属及其氧化物化学分析方法发射光谱法测定氧化铽中氧化镧,氧化铈,氧化镨,氧化钕,氧化钐,氧化铕,氧化钆,氧化镝,氧化钬,氧化铒和氧化钇量" |
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| 26. | Rust attacks metal. |
| 锈能侵蚀金属。 |
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| 27. | Risk of rust |
| 生锈险 |
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| 28. | splotches of rust |
| 锈斑 |
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| 29. | temporary rust prevention |
| 暂时性防锈 |
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| 30. | resistant to rust |
| 不生锈的 |
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