They also devised technologies—permissive action links, go codes, and redundant command-control links—that minimized the chance of accidental or unauthorized launches.

他们还采用各种技术，例如行动授权环节，密码和多保险的指挥控制环节，来减少意外或未经授权发射的可能性。

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Visitors must show their health QR codes and check their temperature before they go into the museum.

参观者在进入博物馆前必须出示健康码并测体温。

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The new codes, which go into effect next Jan. 1, promise greater protection of citizens' rights.

CNN: CHINA

And we went to the stadium gate, where the guy who scanned our bar codes told us we had to go to Will Call, and the lady at Will Call took one look at our tickets and pronounced them fakes.

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They took his smartphone and iPad, asked him for the pin codes to both, and then left the room with the devices to go through them.

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