Traditional: 開機
开机 (kāi jī) means “to start an engine; to boot up (a computer); to press Ctrl-Alt-Delete; to begin shooting a film or TV show”. It is an HSK 2 Chinese word (traditional 開機) in the HSK 3.0 vocabulary.
手机开机了。
Shǒujī kāijī le.
The phone is turned on.
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