下面这段话中sign a deep sign

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下面这段话中sign a deep sign
You 're in a strange city.It's late at night and you're tired.But you can't find your hotel.You sign a deep sign.It seems like you are dreaming a terrible dream.What is happening?
其中的“sign a deep

深深叹了一口气

下面这段话中sign a deep sign sign no sign =not a sign sign a contract是什么意思 A sign of breathe a sign of point ( )a sign. as a sign Make a sign sign up ,sign What's a public sign? This a ______ sign.(direct)