... 外国原始资料 Foreign Source Materials 未知原始资料 An Unknown Source 外部原始资料 External Original Sources ...
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an energy source unknown 一个未知的力量之源
an unknown source
来源不明
以上为机器翻译结果，长、整句建议使用 人工翻译 。
You have received an update from an unknown source.
您已收到一个未知来源的更新。
youdao
Cosmic rays are being produced close to Earth from an unknown source.
宇宙射线由一个未知来源在地球附近产生。
Something “out of the blue” is from an unknown source at an unexpected time.
“出自蓝色(out of the blue)”的东西指的是意想不到，来源不明。
As the monitors were leaving the area, an unknown source fired at three vehicles, she said.
CNN: STORY HIGHLIGHTS
It is probable that it has an animal source, but whether it spreads from contaminated food or something else in the environment is unknown.
BBC: Threat from novel coronavirus 'remains low'
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