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신호는

as for the signal

→ 신호
phrase Rare #23,971
as for the signal 신호 means “signal,” and 는 marks it as the topic. In questions or fragments, it can mean “what about the signal?”
KO: 신호는 잘 잡혀?
EN: Is the signal coming through clearly?

신호는 초록색으로 바뀌었어.

The signal turned green.

생체 신호는?

What are biosignals?

— 마션 (2015)