相关unfasten的文学知识

Youcanunfastenyourseatbeltnow.Pleaseunfastenyoursafetybeltnow.Canyouunfastenthelockcatchofabox?Tounfasten,justlifttheflapandpullout.'I'magoingtoputyouthroughthere.Takethislight;gosoftlyupthestepsstr...