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| 1. | Insects need an external source of sterols. |
| 昆虫需要外界来源的固醇类。 |
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| 2. | external source |
| 外部信源 |
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| 3. | external standard source |
| 外标准源 |
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| 4. | electronic calculator, capable of operation without an external source of power |
| 电子计算器（不需外接电源） |
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| 5. | Awaiting inFORMation from external source. Please be patient. |
| 等待他方提供信息。请耐心等待. |
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| 6. | external power source |
| 外部电源 |
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| 7. | rail locomotive powered from an external source of electricity |
| 铁路机车,外部电源驱动的 |
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| 8. | emitting light during exposure to radiation from an external source. |
| 通过暴露在外部来源的射线里的方法发光。 |
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| 9. | external heat source |
| 外来的热源 |
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| 10. | coach, railway or tramway, powered from an external source of electricity |
| 铁道或电车轨道客车,外部电源驱动 |
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