You have received an update from an unknown source.
您已收到一个未知来源的更新。
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(outofthe blue)”的东西指的是意想不到，来源不明。
Something “out of the blue” is from an unknown source at an unexpected time.
“出自蓝色(outofthe blue)”的东西指的是意想不到，来源不明。
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