【正确答案】Please all remain seated with your seatbelts fastened until the aircraft comes to a complete stop, and then leave via the emergency exits.

【答案解析】(此处until作连词，意为“直到…时候”，原句可理解为“保持坐好、系紧安全带的状态直到飞机停稳后”。seatbelt安全带。emergency exit紧急出口。)